665404523952 has 80 divisors (see below), whose sum is σ = 1965819060480. Its totient is φ = 189990602496.

The previous prime is 665404523939. The next prime is 665404523981. The reversal of 665404523952 is 259325404566.

665404523952 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 665404523895 and 665404523904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138427 + ... + 1161882.

It is an arithmetic number, because the mean of its divisors is an integer number (24572738256).

Almost surely, 2^665404523952 is an apocalyptic number.

It is an amenable number.

665404523952 is an abundant number, since it is smaller than the sum of its proper divisors (1300414536528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665404523952 is a wasteful number, since it uses less digits than its factorization.

665404523952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301850 (or 1301844 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 665404523952 in words is "six hundred sixty-five billion, four hundred four million, five hundred twenty-three thousand, nine hundred fifty-two".