166641502401 has 48 divisors (see below), whose sum is σ = 269254335168. Its totient is φ = 98461440000.

The previous prime is 166641502381. The next prime is 166641502421. The reversal of 166641502401 is 104205146661.

It is an interprime number because it is at equal distance from previous prime (166641502381) and next prime (166641502421).

It is not a de Polignac number, because 166641502401 - 2²¹ = 166639405249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166641502421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 513901 + ... + 772901.

It is an arithmetic number, because the mean of its divisors is an integer number (5609465316).

Almost surely, 2^166641502401 is an apocalyptic number.

166641502401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166641502401 is a deficient number, since it is larger than the sum of its proper divisors (102612832767).

166641502401 is a wasteful number, since it uses less digits than its factorization.

166641502401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259182 (or 259179 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 166641502401 in words is "one hundred sixty-six billion, six hundred forty-one million, five hundred two thousand, four hundred one".