642664043670 has 64 divisors (see below), whose sum is σ = 1682713543680. Its totient is φ = 155787878400.

The previous prime is 642664043657. The next prime is 642664043711. The reversal of 642664043670 is 76340466246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6471190 + ... + 6569750.

It is an arithmetic number, because the mean of its divisors is an integer number (26292399120).

Almost surely, 2^642664043670 is an apocalyptic number.

642664043670 is an abundant number, since it is smaller than the sum of its proper divisors (1040049500010).

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

642664043670 is a wasteful number, since it uses less digits than its factorization.

642664043670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118341.

The product of its (nonzero) digits is 3483648, while the sum is 48.

The spelling of 642664043670 in words is "six hundred forty-two billion, six hundred sixty-four million, forty-three thousand, six hundred seventy".