671407064640 has 224 divisors, whose sum is σ = 2550773420160. Its totient is φ = 165269403648.

The previous prime is 671407064611. The next prime is 671407064659. The reversal of 671407064640 is 46460704176.

It is a super-2 number, since 2×671407064640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2876494 + ... + 3101133.

It is an arithmetic number, because the mean of its divisors is an integer number (11387381340).

Almost surely, 2^671407064640 is an apocalyptic number.

671407064640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671407064640 is an abundant number, since it is smaller than the sum of its proper divisors (1879366355520).

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

671407064640 is a wasteful number, since it uses less digits than its factorization.

671407064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5977666 (or 5977650 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 671407064640 in words is "six hundred seventy-one billion, four hundred seven million, sixty-four thousand, six hundred forty".