665490072536 has 8 divisors (see below), whose sum is σ = 1247793886020. Its totient is φ = 332745036264.

The previous prime is 665490072521. The next prime is 665490072557. The reversal of 665490072536 is 635270094566.

665490072536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

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, 41593129526 + ... + 41593129541.

Almost surely, 2^665490072536 is an apocalyptic number.

It is an amenable number.

665490072536 is a deficient number, since it is larger than the sum of its proper divisors (582303813484).

665490072536 is a wasteful number, since it uses less digits than its factorization.

665490072536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83186259073 (or 83186259069 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 53.

The spelling of 665490072536 in words is "six hundred sixty-five billion, four hundred ninety million, seventy-two thousand, five hundred thirty-six".