6642581958 has 32 divisors (see below), whose sum is σ = 14764274400. Its totient is φ = 2213746848.

The previous prime is 6642581951. The next prime is 6642581969. The reversal of 6642581958 is 8591852466.

6642581958 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 581 + 9 + 58 = 666.

It is a super-2 number, since 2×6642581958² = 88247790137494227528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6642581951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359760 + ... + 377772.

It is an arithmetic number, because the mean of its divisors is an integer number (461383575).

Almost surely, 2^6642581958 is an apocalyptic number.

6642581958 is an abundant number, since it is smaller than the sum of its proper divisors (8121692442).

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

6642581958 is a wasteful number, since it uses less digits than its factorization.

6642581958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24853 (or 24847 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 6642581958 is about 81502.0365267028. The cubic root of 6642581958 is about 1879.8028650620.

The spelling of 6642581958 in words is "six billion, six hundred forty-two million, five hundred eighty-one thousand, nine hundred fifty-eight".