665430725864 has 32 divisors (see below), whose sum is σ = 1299066620040. Its totient is φ = 319279027200.

The previous prime is 665430725831. The next prime is 665430725873. The reversal of 665430725864 is 468527034566.

665430725864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 274733222500 + 390697503364 = 524150^2 + 625058^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16609109 + ... + 16649124.

Almost surely, 2^665430725864 is an apocalyptic number.

It is an amenable number.

665430725864 is a deficient number, since it is larger than the sum of its proper divisors (633635894176).

665430725864 is a wasteful number, since it uses less digits than its factorization.

665430725864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33258341 (or 33258337 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 56.

The spelling of 665430725864 in words is "six hundred sixty-five billion, four hundred thirty million, seven hundred twenty-five thousand, eight hundred sixty-four".