23257212157 has 16 divisors (see below), whose sum is σ = 25219212480. Its totient is φ = 21398025600.

The previous prime is 23257212149. The next prime is 23257212169. The reversal of 23257212157 is 75121275232.

It is a cyclic number.

It is not a de Polignac number, because 23257212157 - 2³ = 23257212149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23257212557) 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, 176319 + ... + 278572.

It is an arithmetic number, because the mean of its divisors is an integer number (1576200780).

Almost surely, 2^23257212157 is an apocalyptic number.

It is an amenable number.

23257212157 is a deficient number, since it is larger than the sum of its proper divisors (1962000323).

23257212157 is a wasteful number, since it uses less digits than its factorization.

23257212157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455004.

The product of its digits is 58800, while the sum is 37.

Adding to 23257212157 its reverse (75121275232), we get a palindrome (98378487389).

The spelling of 23257212157 in words is "twenty-three billion, two hundred fifty-seven million, two hundred twelve thousand, one hundred fifty-seven".