166416512521626 has 20 divisors (see below), whose sum is σ = 372896259539562. Its totient is φ = 55472170840488.

The previous prime is 166416512521619. The next prime is 166416512521703. The reversal of 166416512521626 is 626125215614661.

It is a happy number.

166416512521626 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 1 + 6 + 5 + 1 + 2 + 5 + 2 + 1 + 626 = 666.

It can be written as a sum of positive squares in only one way, i.e., 124056135526401 + 42360376995225 = 11138049^2 + 6508485^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 513631211325 + ... + 513631211648.

Almost surely, 2^{166416512521626} is an apocalyptic number.

166416512521626 is an abundant number, since it is smaller than the sum of its proper divisors (206479747017936).

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

166416512521626 is a wasteful number, since it uses less digits than its factorization.

166416512521626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027262422987 (or 1027262422978 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 166416512521626 in words is "one hundred sixty-six trillion, four hundred sixteen billion, five hundred twelve million, five hundred twenty-one thousand, six hundred twenty-six".