665520052 has 6 divisors (see below), whose sum is σ = 1164660098. Its totient is φ = 332760024.

The previous prime is 665519989. The next prime is 665520071. The reversal of 665520052 is 250025566.

It can be written as a sum of positive squares in only one way, i.e., 665433616 + 86436 = 25796^2 + 294^2 .

It is a super-2 number, since 2×665520052² = 885833879228165408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665519996 and 665520023.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83190003 + ... + 83190010.

Almost surely, 2^665520052 is an apocalyptic number.

It is an amenable number.

665520052 is a deficient number, since it is larger than the sum of its proper divisors (499140046).

665520052 is a wasteful number, since it uses less digits than its factorization.

665520052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166380017 (or 166380015 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 665520052 is about 25797.6753216254. The cubic root of 665520052 is about 873.0793472454.

The spelling of 665520052 in words is "six hundred sixty-five million, five hundred twenty thousand, fifty-two".