23372171981 has 4 divisors (see below), whose sum is σ = 23813156412. Its totient is φ = 22931187552.

The previous prime is 23372171959. The next prime is 23372171989. The reversal of 23372171981 is 18917127332.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18678688900 + 4693483081 = 136670^2 + 68509^2 .

It is a cyclic number.

It is not a de Polignac number, because 23372171981 - 2⁶ = 23372171917 is a prime.

It is a super-2 number, since 2×23372171981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23372171989) by changing a digit.

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, 220492136 + ... + 220492241.

It is an arithmetic number, because the mean of its divisors is an integer number (5953289103).

Almost surely, 2^23372171981 is an apocalyptic number.

It is an amenable number.

23372171981 is a deficient number, since it is larger than the sum of its proper divisors (440984431).

23372171981 is an equidigital number, since it uses as much as digits as its factorization.

23372171981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440984430.

The product of its digits is 127008, while the sum is 44.

The spelling of 23372171981 in words is "twenty-three billion, three hundred seventy-two million, one hundred seventy-one thousand, nine hundred eighty-one".