667402305422640 has 40 divisors (see below), whose sum is σ = 2068947146810928. Its totient is φ = 177973948112640.

The previous prime is 667402305422621. The next prime is 667402305422659. The reversal of 667402305422640 is 46224503204766.

It is an interprime number because it is at equal distance from previous prime (667402305422621) and next prime (667402305422659).

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1390421469391 + ... + 1390421469870.

Almost surely, 2^{667402305422640} is an apocalyptic number.

667402305422640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667402305422640 is an abundant number, since it is smaller than the sum of its proper divisors (1401544841388288).

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

667402305422640 is a wasteful number, since it uses less digits than its factorization.

667402305422640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780842939277 (or 2780842939271 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 51.

The spelling of 667402305422640 in words is "six hundred sixty-seven trillion, four hundred two billion, three hundred five million, four hundred twenty-two thousand, six hundred forty".