166214331554551 has 12 divisors (see below), whose sum is σ = 193908573843048. Its totient is φ = 142058852314512.

The previous prime is 166214331554539. The next prime is 166214331554599. The reversal of 166214331554551 is 155455133412661.

It is a happy number.

It is not a de Polignac number, because 166214331554551 - 2⁵ = 166214331554519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166214331554951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4887777256 + ... + 4887811261.

It is an arithmetic number, because the mean of its divisors is an integer number (16159047820254).

Almost surely, 2^{166214331554551} is an apocalyptic number.

166214331554551 is a deficient number, since it is larger than the sum of its proper divisors (27694242288497).

166214331554551 is an equidigital number, since it uses as much as digits as its factorization.

166214331554551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9775588878 (or 9775588871 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 52.

The spelling of 166214331554551 in words is "one hundred sixty-six trillion, two hundred fourteen billion, three hundred thirty-one million, five hundred fifty-four thousand, five hundred fifty-one".