166420254333531 has 32 divisors (see below), whose sum is σ = 244499990353920. Its totient is φ = 99846830592000.

The previous prime is 166420254333527. The next prime is 166420254333569. The reversal of 166420254333531 is 135333452024661.

It is not a de Polignac number, because 166420254333531 - 2² = 166420254333527 is a prime.

It is a super-2 number, since 2×166420254333531² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166420254337531) 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, 17937366 + ... + 25584948.

It is an arithmetic number, because the mean of its divisors is an integer number (7640624698560).

Almost surely, 2^{166420254333531} is an apocalyptic number.

166420254333531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166420254333531 is a deficient number, since it is larger than the sum of its proper divisors (78079736020389).

166420254333531 is a wasteful number, since it uses less digits than its factorization.

166420254333531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654227.

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 166420254333531 in words is "one hundred sixty-six trillion, four hundred twenty billion, two hundred fifty-four million, three hundred thirty-three thousand, five hundred thirty-one".