157217808166 has 4 divisors (see below), whose sum is σ = 235826712252. Its totient is φ = 78608904082.

The previous prime is 157217808133. The next prime is 157217808191. The reversal of 157217808166 is 661808712751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661808712751 = 125383 ⋅5278297.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304452040 + ... + 39304452043.

It is an arithmetic number, because the mean of its divisors is an integer number (58956678063).

Almost surely, 2^157217808166 is an apocalyptic number.

157217808166 is a deficient number, since it is larger than the sum of its proper divisors (78608904086).

157217808166 is an equidigital number, since it uses as much as digits as its factorization.

157217808166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78608904085.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 157217808166 in words is "one hundred fifty-seven billion, two hundred seventeen million, eight hundred eight thousand, one hundred sixty-six".