1966915650 has 192 divisors, whose sum is σ = 5750489088. Its totient is φ = 435663360.

The previous prime is 1966915649. The next prime is 1966915651. The reversal of 1966915650 is 565196691.

It is an interprime number because it is at equal distance from previous prime (1966915649) and next prime (1966915651).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966915650.

It is not an unprimeable number, because it can be changed into a prime (1966915651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5135359 + ... + 5135741.

It is an arithmetic number, because the mean of its divisors is an integer number (29950464).

Almost surely, 2^1966915650 is an apocalyptic number.

1966915650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1966915650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2875244544).

1966915650 is an abundant number, since it is smaller than the sum of its proper divisors (3783573438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1966915650 is a wasteful number, since it uses less digits than its factorization.

1966915650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 48.

The square root of 1966915650 is about 44349.9227733262. The cubic root of 1966915650 is about 1252.9351080517.

The spelling of 1966915650 in words is "one billion, nine hundred sixty-six million, nine hundred fifteen thousand, six hundred fifty".