165415972 has 6 divisors (see below), whose sum is σ = 289477958. Its totient is φ = 82707984.

The previous prime is 165415951. The next prime is 165415973. The reversal of 165415972 is 279514561.

It can be written as a sum of positive squares in only one way, i.e., 109704676 + 55711296 = 10474^2 + 7464^2 .

It is not an unprimeable number, because it can be changed into a prime (165415973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20676993 + ... + 20677000.

Almost surely, 2^165415972 is an apocalyptic number.

It is an amenable number.

165415972 is a deficient number, since it is larger than the sum of its proper divisors (124061986).

165415972 is a wasteful number, since it uses less digits than its factorization.

165415972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41353997 (or 41353995 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The square root of 165415972 is about 12861.4140746654. The cubic root of 165415972 is about 548.9411827902.

The spelling of 165415972 in words is "one hundred sixty-five million, four hundred fifteen thousand, nine hundred seventy-two".