642159123990 has 32 divisors (see below), whose sum is σ = 1555321188960. Its totient is φ = 169671400704.

The previous prime is 642159123959. The next prime is 642159123997. The reversal of 642159123990 is 99321951246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642159123997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98186199 + ... + 98192738.

It is an arithmetic number, because the mean of its divisors is an integer number (48603787155).

Almost surely, 2^642159123990 is an apocalyptic number.

642159123990 is an abundant number, since it is smaller than the sum of its proper divisors (913162064970).

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

642159123990 is a wasteful number, since it uses less digits than its factorization.

642159123990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196379056.

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 642159123990 in words is "six hundred forty-two billion, one hundred fifty-nine million, one hundred twenty-three thousand, nine hundred ninety".