15977680491 has 16 divisors (see below), whose sum is σ = 21437942400. Its totient is φ = 10584803328.

The previous prime is 15977680487. The next prime is 15977680517. The reversal of 15977680491 is 19408677951.

15977680491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15977680491 - 2² = 15977680487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15977680451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298320 + ... + 347778.

It is an arithmetic number, because the mean of its divisors is an integer number (1339871400).

Almost surely, 2^15977680491 is an apocalyptic number.

15977680491 is a deficient number, since it is larger than the sum of its proper divisors (5460261909).

15977680491 is a wasteful number, since it uses less digits than its factorization.

15977680491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50138.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 15977680491 in words is "fifteen billion, nine hundred seventy-seven million, six hundred eighty thousand, four hundred ninety-one".