15977680489 has 8 divisors (see below), whose sum is σ = 16040309768. Its totient is φ = 15915087360.

The previous prime is 15977680487. The next prime is 15977680517. The reversal of 15977680489 is 98408677951.

It can be written as a sum of positive squares in 4 ways, for example, as 8700225625 + 7277454864 = 93275^2 + 85308^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15977680489 - 2¹ = 15977680487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15977680489.

It is not an unprimeable number, because it can be changed into a prime (15977680487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173529 + ... + 1187065.

It is an arithmetic number, because the mean of its divisors is an integer number (2005038721).

Almost surely, 2^15977680489 is an apocalyptic number.

It is an amenable number.

15977680489 is a deficient number, since it is larger than the sum of its proper divisors (62629279).

15977680489 is a wasteful number, since it uses less digits than its factorization.

15977680489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18075.

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 15977680489 in words is "fifteen billion, nine hundred seventy-seven million, six hundred eighty thousand, four hundred eighty-nine".