1966428550 has 12 divisors (see below), whose sum is σ = 3657557196. Its totient is φ = 786571400.

The previous prime is 1966428481. The next prime is 1966428551. The reversal of 1966428550 is 558246691.

It is a self number, because there is not a number n which added to its sum of digits gives 1966428550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966428551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19664236 + ... + 19664335.

It is an arithmetic number, because the mean of its divisors is an integer number (304796433).

Almost surely, 2^1966428550 is an apocalyptic number.

1966428550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1966428550 is a deficient number, since it is larger than the sum of its proper divisors (1691128646).

1966428550 is a wasteful number, since it uses less digits than its factorization.

1966428550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39328583 (or 39328578 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 1966428550 is about 44344.4308791983. The cubic root of 1966428550 is about 1252.8316711337.

The spelling of 1966428550 in words is "one billion, nine hundred sixty-six million, four hundred twenty-eight thousand, five hundred fifty".