642168432738 has 48 divisors (see below), whose sum is σ = 1594096897536. Its totient is φ = 183019132800.

The previous prime is 642168432733. The next prime is 642168432767. The reversal of 642168432738 is 837234861246.

642168432738 is a `hidden beast` number, since 6 + 42 + 168 + 432 + 7 + 3 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (642168432733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6304306 + ... + 6405357.

It is an arithmetic number, because the mean of its divisors is an integer number (33210352032).

Almost surely, 2^642168432738 is an apocalyptic number.

642168432738 is an abundant number, since it is smaller than the sum of its proper divisors (951928464798).

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

642168432738 is a wasteful number, since it uses less digits than its factorization.

642168432738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12710079 (or 12710076 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 54.

The spelling of 642168432738 in words is "six hundred forty-two billion, one hundred sixty-eight million, four hundred thirty-two thousand, seven hundred thirty-eight".