166815410436381 has 32 divisors (see below), whose sum is σ = 262961343129600. Its totient is φ = 92035706938560.

The previous prime is 166815410436229. The next prime is 166815410436413. The reversal of 166815410436381 is 183634014518661.

It is not a de Polignac number, because 166815410436381 - 2²² = 166815406242077 is a prime.

It is a super-2 number, since 2×166815410436381² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166815410434381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211281576 + ... + 212069646.

It is an arithmetic number, because the mean of its divisors is an integer number (8217541972800).

Almost surely, 2^{166815410436381} is an apocalyptic number.

It is an amenable number.

166815410436381 is a deficient number, since it is larger than the sum of its proper divisors (96145932693219).

166815410436381 is a wasteful number, since it uses less digits than its factorization.

166815410436381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135689.

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 166815410436381 in words is "one hundred sixty-six trillion, eight hundred fifteen billion, four hundred ten million, four hundred thirty-six thousand, three hundred eighty-one".