23721645761 has 8 divisors (see below), whose sum is σ = 26033120064. Its totient is φ = 21435998320.

The previous prime is 23721645743. The next prime is 23721645791. The reversal of 23721645761 is 16754612732.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23721645761 - 2¹⁴ = 23721629377 is a prime.

It is a super-2 number, since 2×23721645761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23721645721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6454790 + ... + 6458463.

It is an arithmetic number, because the mean of its divisors is an integer number (3254140008).

Almost surely, 2^23721645761 is an apocalyptic number.

It is an amenable number.

23721645761 is a deficient number, since it is larger than the sum of its proper divisors (2311474303).

23721645761 is a wasteful number, since it uses less digits than its factorization.

23721645761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12913431.

The product of its digits is 423360, while the sum is 44.

The spelling of 23721645761 in words is "twenty-three billion, seven hundred twenty-one million, six hundred forty-five thousand, seven hundred sixty-one".