166737706640 has 20 divisors (see below), whose sum is σ = 387665168124. Its totient is φ = 66695082624.

The previous prime is 166737706637. The next prime is 166737706699. The reversal of 166737706640 is 46607737661.

It can be written as a sum of positive squares in 2 ways, for example, as 37221213184 + 129516493456 = 192928^2 + 359884^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042110587 + ... + 1042110746.

Almost surely, 2^166737706640 is an apocalyptic number.

166737706640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166737706640 is an abundant number, since it is smaller than the sum of its proper divisors (220927461484).

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

166737706640 is a wasteful number, since it uses less digits than its factorization.

166737706640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084221346 (or 2084221340 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 53.

The spelling of 166737706640 in words is "one hundred sixty-six billion, seven hundred thirty-seven million, seven hundred six thousand, six hundred forty".