15949698977 has 4 divisors (see below), whose sum is σ = 15983852976. Its totient is φ = 15915544980.

The previous prime is 15949698943. The next prime is 15949698991. The reversal of 15949698977 is 77989694951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15949698977 - 2⁶ = 15949698913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15949698997) 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 3 ways as a sum of consecutive naturals, for example, 17076299 + ... + 17077232.

It is an arithmetic number, because the mean of its divisors is an integer number (3995963244).

Almost surely, 2^15949698977 is an apocalyptic number.

It is an amenable number.

15949698977 is a deficient number, since it is larger than the sum of its proper divisors (34153999).

15949698977 is an equidigital number, since it uses as much as digits as its factorization.

15949698977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34153998.

The product of its digits is 308629440, while the sum is 74.

The spelling of 15949698977 in words is "fifteen billion, nine hundred forty-nine million, six hundred ninety-eight thousand, nine hundred seventy-seven".