15684990077 has 6 divisors (see below), whose sum is σ = 15981862302. Its totient is φ = 15388152312.

The previous prime is 15684990037. The next prime is 15684990089. The reversal of 15684990077 is 77009948651.

It can be written as a sum of positive squares in only one way, i.e., 14501217241 + 1183772836 = 120421^2 + 34406^2 .

It is not a de Polignac number, because 15684990077 - 2³² = 11390022781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15684990037) 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, 903158 + ... + 920360.

It is an arithmetic number, because the mean of its divisors is an integer number (2663643717).

Almost surely, 2^15684990077 is an apocalyptic number.

It is an amenable number.

15684990077 is a deficient number, since it is larger than the sum of its proper divisors (296872225).

15684990077 is an frugal number, since it uses more digits than its factorization.

15684990077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34459 (or 17256 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 15684990077 in words is "fifteen billion, six hundred eighty-four million, nine hundred ninety thousand, seventy-seven".