15521671396 has 81 divisors (see below), whose sum is σ = 34774327497. Its totient is φ = 6039929280.

The previous prime is 15521671351. The next prime is 15521671423. The reversal of 15521671396 is 69317612551.

The square root of 15521671396 is 124586.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13662336996 + 1859334400 = 116886^2 + 43120^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19185840 + ... + 19186648.

Almost surely, 2^15521671396 is an apocalyptic number.

15521671396 is the 124586-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15521671396

15521671396 is an abundant number, since it is smaller than the sum of its proper divisors (19252656101).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15521671396 is an equidigital number, since it uses as much as digits as its factorization.

15521671396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 829 counting only the distinct ones).

The product of its digits is 340200, while the sum is 46.

The spelling of 15521671396 in words is "fifteen billion, five hundred twenty-one million, six hundred seventy-one thousand, three hundred ninety-six".