642671661174 has 32 divisors (see below), whose sum is σ = 1353532688640. Its totient is φ = 203029893792.

The previous prime is 642671661113. The next prime is 642671661193. The reversal of 642671661174 is 471166176246.

It is a super-2 number, since 2×642671661174² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 21347532 + ... + 21377615.

It is an arithmetic number, because the mean of its divisors is an integer number (42297896520).

Almost surely, 2^642671661174 is an apocalyptic number.

642671661174 is an abundant number, since it is smaller than the sum of its proper divisors (710861027466).

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

642671661174 is a wasteful number, since it uses less digits than its factorization.

642671661174 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42725284.

The product of its digits is 2032128, while the sum is 51.

The spelling of 642671661174 in words is "six hundred forty-two billion, six hundred seventy-one million, six hundred sixty-one thousand, one hundred seventy-four".