667644461045140 has 36 divisors (see below), whose sum is σ = 1452067162578396. Its totient is φ = 257848895293696.

The previous prime is 667644461045131. The next prime is 667644461045251. The reversal of 667644461045140 is 41540164446766.

It can be written as a sum of positive squares in 6 ways, for example, as 17821872787216 + 649822588257924 = 4221596^2 + 25491618^2 .

It is a super-2 number, since 2×667644461045140² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19846726969 + ... + 19846760608.

It is an arithmetic number, because the mean of its divisors is an integer number (40335198960511).

Almost surely, 2^{667644461045140} is an apocalyptic number.

It is an amenable number.

667644461045140 is an abundant number, since it is smaller than the sum of its proper divisors (784422701533256).

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

667644461045140 is a wasteful number, since it uses less digits than its factorization.

667644461045140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39693487644 (or 39693487613 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 58.

The spelling of 667644461045140 in words is "six hundred sixty-seven trillion, six hundred forty-four billion, four hundred sixty-one million, forty-five thousand, one hundred forty".