16521774532 has 6 divisors (see below), whose sum is σ = 28913105438. Its totient is φ = 8260887264.

The previous prime is 16521774509. The next prime is 16521774541. The reversal of 16521774532 is 23547712561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15211768896 + 1310005636 = 123336^2 + 36194^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2065221813 + ... + 2065221820.

Almost surely, 2^16521774532 is an apocalyptic number.

It is an amenable number.

16521774532 is a deficient number, since it is larger than the sum of its proper divisors (12391330906).

16521774532 is a wasteful number, since it uses less digits than its factorization.

16521774532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130443637 (or 4130443635 counting only the distinct ones).

The product of its digits is 352800, while the sum is 43.

The spelling of 16521774532 in words is "sixteen billion, five hundred twenty-one million, seven hundred seventy-four thousand, five hundred thirty-two".