23749981997 has 4 divisors (see below), whose sum is σ = 27142836576. Its totient is φ = 20357127420.

The previous prime is 23749981991. The next prime is 23749982017. The reversal of 23749981997 is 79918994732.

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 23749981997 - 2⁶ = 23749981933 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 (23749981991) 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, 1696427279 + ... + 1696427292.

It is an arithmetic number, because the mean of its divisors is an integer number (6785709144).

Almost surely, 2^23749981997 is an apocalyptic number.

It is an amenable number.

23749981997 is a deficient number, since it is larger than the sum of its proper divisors (3392854579).

23749981997 is an equidigital number, since it uses as much as digits as its factorization.

23749981997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392854578.

The product of its digits is 61725888, while the sum is 68.

The spelling of 23749981997 in words is "twenty-three billion, seven hundred forty-nine million, nine hundred eighty-one thousand, nine hundred ninety-seven".