166736543533257 has 4 divisors (see below), whose sum is σ = 222315391377680. Its totient is φ = 111157695688836.

The previous prime is 166736543533253. The next prime is 166736543533291. The reversal of 166736543533257 is 752335345637661.

It is a happy number.

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 not a de Polignac number, because 166736543533257 - 2² = 166736543533253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166736543533253) 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, 27789423922207 + ... + 27789423922212.

It is an arithmetic number, because the mean of its divisors is an integer number (55578847844420).

Almost surely, 2^{166736543533257} is an apocalyptic number.

It is an amenable number.

166736543533257 is a deficient number, since it is larger than the sum of its proper divisors (55578847844423).

166736543533257 is an equidigital number, since it uses as much as digits as its factorization.

166736543533257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55578847844422.

The product of its digits is 857304000, while the sum is 66.

The spelling of 166736543533257 in words is "one hundred sixty-six trillion, seven hundred thirty-six billion, five hundred forty-three million, five hundred thirty-three thousand, two hundred fifty-seven".