6642156534 has 64 divisors (see below), whose sum is σ = 15545026560. Its totient is φ = 1873704960.

The previous prime is 6642156533. The next prime is 6642156539. The reversal of 6642156534 is 4356512466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642156533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26347 + ... + 118230.

It is an arithmetic number, because the mean of its divisors is an integer number (242891040).

Almost surely, 2^6642156534 is an apocalyptic number.

6642156534 is an abundant number, since it is smaller than the sum of its proper divisors (8902870026).

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

6642156534 is a wasteful number, since it uses less digits than its factorization.

6642156534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144645.

The product of its digits is 518400, while the sum is 42.

The square root of 6642156534 is about 81499.4265869399. The cubic root of 6642156534 is about 1879.7627335623.

The spelling of 6642156534 in words is "six billion, six hundred forty-two million, one hundred fifty-six thousand, five hundred thirty-four".