166015231552517 has 4 divisors (see below), whose sum is σ = 166493661614976. Its totient is φ = 165536801490060.

The previous prime is 166015231552477. The next prime is 166015231552661. The reversal of 166015231552517 is 715255132510661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166015231552517 - 2²⁴ = 166015214775301 is a prime.

It is a super-2 number, since 2×166015231552517² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166015231552717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239215030709 + ... + 239215031402.

It is an arithmetic number, because the mean of its divisors is an integer number (41623415403744).

Almost surely, 2^{166015231552517} is an apocalyptic number.

It is an amenable number.

166015231552517 is a deficient number, since it is larger than the sum of its proper divisors (478430062459).

166015231552517 is an equidigital number, since it uses as much as digits as its factorization.

166015231552517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478430062458.

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 166015231552517 in words is "one hundred sixty-six trillion, fifteen billion, two hundred thirty-one million, five hundred fifty-two thousand, five hundred seventeen".