665167621830 has 32 divisors (see below), whose sum is σ = 1604505871584. Its totient is φ = 176477634816.

The previous prime is 665167621817. The next prime is 665167621837. The reversal of 665167621830 is 38126761566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665167621837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56268847 + ... + 56280666.

It is an arithmetic number, because the mean of its divisors is an integer number (50140808487).

Almost surely, 2^665167621830 is an apocalyptic number.

665167621830 is an abundant number, since it is smaller than the sum of its proper divisors (939338249754).

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

665167621830 is a wasteful number, since it uses less digits than its factorization.

665167621830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112549720.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 665167621830 in words is "six hundred sixty-five billion, one hundred sixty-seven million, six hundred twenty-one thousand, eight hundred thirty".