667309697280 has 108 divisors (see below), whose sum is σ = 2308822081020. Its totient is φ = 177949249536.

The previous prime is 667309697221. The next prime is 667309697303. The reversal of 667309697280 is 82796903766.

It can be written as a sum of positive squares in 2 ways, for example, as 351753375744 + 315556321536 = 593088^2 + 561744^2 .

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, 28951575 + ... + 28974614.

Almost surely, 2^667309697280 is an apocalyptic number.

667309697280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667309697280 is an abundant number, since it is smaller than the sum of its proper divisors (1641512383740).

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

667309697280 is a wasteful number, since it uses less digits than its factorization.

667309697280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57926216 (or 57926199 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 63.

The spelling of 667309697280 in words is "six hundred sixty-seven billion, three hundred nine million, six hundred ninety-seven thousand, two hundred eighty".