23857621955 has 4 divisors (see below), whose sum is σ = 28629146352. Its totient is φ = 19086097560.

The previous prime is 23857621859. The next prime is 23857621967. The reversal of 23857621955 is 55912675832.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 23857621955 - 2³² = 19562654659 is a prime.

It is a super-2 number, since 2×23857621955² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23857621897 and 23857621906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385762191 + ... + 2385762200.

It is an arithmetic number, because the mean of its divisors is an integer number (7157286588).

Almost surely, 2^23857621955 is an apocalyptic number.

23857621955 is a deficient number, since it is larger than the sum of its proper divisors (4771524397).

23857621955 is an equidigital number, since it uses as much as digits as its factorization.

23857621955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4771524396.

The product of its digits is 4536000, while the sum is 53.

The spelling of 23857621955 in words is "twenty-three billion, eight hundred fifty-seven million, six hundred twenty-one thousand, nine hundred fifty-five".