166916267606655 has 48 divisors (see below), whose sum is σ = 330654087266880. Its totient is φ = 76304369585664.

The previous prime is 166916267606639. The next prime is 166916267606677. The reversal of 166916267606655 is 556606762619661.

166916267606655 is a `hidden beast` number, since 1 + 6 + 6 + 9 + 1 + 6 + 2 + 6 + 7 + 606 + 6 + 5 + 5 = 666.

It is not a de Polignac number, because 166916267606655 - 2⁴ = 166916267606639 is a prime.

It is a super-2 number, since 2×166916267606655² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 218079609 + ... + 218843661.

It is an arithmetic number, because the mean of its divisors is an integer number (6888626818060).

Almost surely, 2^{166916267606655} is an apocalyptic number.

166916267606655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166916267606655 is a deficient number, since it is larger than the sum of its proper divisors (163737819660225).

166916267606655 is a wasteful number, since it uses less digits than its factorization.

166916267606655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457600 (or 1457597 counting only the distinct ones).

The product of its (nonzero) digits is 881798400, while the sum is 72.

The spelling of 166916267606655 in words is "one hundred sixty-six trillion, nine hundred sixteen billion, two hundred sixty-seven million, six hundred six thousand, six hundred fifty-five".