158722257 has 16 divisors (see below), whose sum is σ = 223784960. Its totient is φ = 99788112.

The previous prime is 158722253. The next prime is 158722273. The reversal of 158722257 is 752227851.

It is not a de Polignac number, because 158722257 - 2² = 158722253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158722253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6468 + ... + 18954.

It is an arithmetic number, because the mean of its divisors is an integer number (13986560).

Almost surely, 2^158722257 is an apocalyptic number.

It is an amenable number.

158722257 is a deficient number, since it is larger than the sum of its proper divisors (65062703).

158722257 is a wasteful number, since it uses less digits than its factorization.

158722257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12732.

The product of its digits is 78400, while the sum is 39.

The square root of 158722257 is about 12598.5021728775. The cubic root of 158722257 is about 541.4345225457.

The spelling of 158722257 in words is "one hundred fifty-eight million, seven hundred twenty-two thousand, two hundred fifty-seven".