166562215641 has 12 divisors (see below), whose sum is σ = 243293125140. Its totient is φ = 109793819520.

The previous prime is 166562215639. The next prime is 166562215661. The reversal of 166562215641 is 146512265661.

166562215641 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 62 + 21 + 564 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 88164455625 + 78397760016 = 296925^2 + 279996^2 .

It is not a de Polignac number, because 166562215641 - 2¹ = 166562215639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166562215601) 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, 103970620 + ... + 103972221.

It is an arithmetic number, because the mean of its divisors is an integer number (20274427095).

Almost surely, 2^166562215641 is an apocalyptic number.

It is an amenable number.

166562215641 is a deficient number, since it is larger than the sum of its proper divisors (76730909499).

166562215641 is a wasteful number, since it uses less digits than its factorization.

166562215641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207942936 (or 207942933 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 166562215641 in words is "one hundred sixty-six billion, five hundred sixty-two million, two hundred fifteen thousand, six hundred forty-one".