15641504356 has 9 divisors (see below), whose sum is σ = 27373070361. Its totient is φ = 7820627112.

The previous prime is 15641504327. The next prime is 15641504369. The reversal of 15641504356 is 65340514651.

It is a happy number.

The square root of 15641504356 is 125066.

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., 11922456100 + 3719048256 = 109190^2 + 60984^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 218866 + ... + 281398.

Almost surely, 2^15641504356 is an apocalyptic number.

15641504356 is the 125066-th square number.

It is an amenable number.

15641504356 is a deficient number, since it is larger than the sum of its proper divisors (11731566005).

15641504356 is an frugal number, since it uses more digits than its factorization.

15641504356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125070 (or 62535 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 15641504356 in words is "fifteen billion, six hundred forty-one million, five hundred four thousand, three hundred fifty-six".