664170961838 has 8 divisors (see below), whose sum is σ = 999127499832. Its totient is φ = 331128461896.

The previous prime is 664170961829. The next prime is 664170961859. The reversal of 664170961838 is 838169071466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×664170961838² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478508645 + ... + 478510032.

It is an arithmetic number, because the mean of its divisors is an integer number (124890937479).

Almost surely, 2^664170961838 is an apocalyptic number.

664170961838 is a deficient number, since it is larger than the sum of its proper divisors (334956537994).

664170961838 is a wasteful number, since it uses less digits than its factorization.

664170961838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957019026.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 664170961838 in words is "six hundred sixty-four billion, one hundred seventy million, nine hundred sixty-one thousand, eight hundred thirty-eight".