661726511041168 has 160 divisors (see below), whose sum is σ = 1303203747871872. Its totient is φ = 325474622054400.

The previous prime is 661726511041103. The next prime is 661726511041177. The reversal of 661726511041168 is 861140115627166.

It is a super-2 number, since 2×661726511041168² (a number of 30 digits) contains 22 as substring.

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, 156030771528 + ... + 156030775768.

Almost surely, 2^{661726511041168} is an apocalyptic number.

It is an amenable number.

661726511041168 is a deficient number, since it is larger than the sum of its proper divisors (641477236830704).

661726511041168 is a wasteful number, since it uses less digits than its factorization.

661726511041168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873 (or 5867 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 661726511041168 in words is "six hundred sixty-one trillion, seven hundred twenty-six billion, five hundred eleven million, forty-one thousand, one hundred sixty-eight".