166551650901 has 40 divisors (see below), whose sum is σ = 254659356864. Its totient is φ = 108420742080.

The previous prime is 166551650843. The next prime is 166551650953. The reversal of 166551650901 is 109056155661.

166551650901 is a `hidden beast` number, since 1 + 6 + 6 + 551 + 6 + 5 + 0 + 90 + 1 = 666.

It is not a de Polignac number, because 166551650901 - 2⁷ = 166551650773 is a prime.

It is a super-2 number, since 2×166551650901² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166551650981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21977425 + ... + 21985001.

Almost surely, 2^166551650901 is an apocalyptic number.

It is an amenable number.

166551650901 is a deficient number, since it is larger than the sum of its proper divisors (88107705963).

166551650901 is an equidigital number, since it uses as much as digits as its factorization.

166551650901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13943 (or 13934 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

The spelling of 166551650901 in words is "one hundred sixty-six billion, five hundred fifty-one million, six hundred fifty thousand, nine hundred one".