165976389604 has 27 divisors (see below), whose sum is σ = 300176244963. Its totient is φ = 80298934200.

The previous prime is 165976389583. The next prime is 165976389611. The reversal of 165976389604 is 406983679561.

The square root of 165976389604 is 407402.

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

It is a super-3 number, since 3×165976389604³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25255639 + ... + 25262209.

Almost surely, 2^165976389604 is an apocalyptic number.

165976389604 is the 407402-nd square number.

It is an amenable number.

165976389604 is a deficient number, since it is larger than the sum of its proper divisors (134199855359).

165976389604 is an frugal number, since it uses more digits than its factorization.

165976389604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13208 (or 6604 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 64.

Multiplying 165976389604 by its sum of digits (64), we get a square (10622488934656 = 3259216²).

The spelling of 165976389604 in words is "one hundred sixty-five billion, nine hundred seventy-six million, three hundred eighty-nine thousand, six hundred four".