1966881015 has 72 divisors (see below), whose sum is σ = 3854563440. Its totient is φ = 950891040.

The previous prime is 1966881013. The next prime is 1966881019. The reversal of 1966881015 is 5101886691.

It is not a de Polignac number, because 1966881015 - 2¹ = 1966881013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966881013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5668072 + ... + 5668418.

Almost surely, 2^1966881015 is an apocalyptic number.

1966881015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1966881015 is a deficient number, since it is larger than the sum of its proper divisors (1887682425).

1966881015 is an equidigital number, since it uses as much as digits as its factorization.

1966881015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1966881015 is about 44349.5322974211. The cubic root of 1966881015 is about 1252.9277537857.

The spelling of 1966881015 in words is "one billion, nine hundred sixty-six million, eight hundred eighty-one thousand, fifteen".