166415815899 has 64 divisors (see below), whose sum is σ = 255876741120. Its totient is φ = 106821711360.

The previous prime is 166415815877. The next prime is 166415815921. The reversal of 166415815899 is 998518514661.

166415815899 is a `hidden beast` number, since 1 + 6 + 6 + 41 + 5 + 8 + 1 + 589 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (166415815877) and next prime (166415815921).

It is a de Polignac number, because none of the positive numbers 2^k-166415815899 is a prime.

It is a super-2 number, since 2×166415815899² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166415815859) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35686242 + ... + 35690904.

It is an arithmetic number, because the mean of its divisors is an integer number (3998074080).

Almost surely, 2^166415815899 is an apocalyptic number.

166415815899 is a deficient number, since it is larger than the sum of its proper divisors (89460925221).

166415815899 is a wasteful number, since it uses less digits than its factorization.

166415815899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129 (or 5123 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 63.

The spelling of 166415815899 in words is "one hundred sixty-six billion, four hundred fifteen million, eight hundred fifteen thousand, eight hundred ninety-nine".