23640651661 has 8 divisors (see below), whose sum is σ = 25811542944. Its totient is φ = 21473383920.

The previous prime is 23640651631. The next prime is 23640651703. The reversal of 23640651661 is 16615604632.

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

It is a cyclic number.

It is not a de Polignac number, because 23640651661 - 2¹³ = 23640643469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640651631) 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, 892230 + ... + 918343.

It is an arithmetic number, because the mean of its divisors is an integer number (3226442868).

Almost surely, 2^23640651661 is an apocalyptic number.

It is an amenable number.

23640651661 is a deficient number, since it is larger than the sum of its proper divisors (2170891283).

23640651661 is a wasteful number, since it uses less digits than its factorization.

23640651661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811771.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 23640651661 in words is "twenty-three billion, six hundred forty million, six hundred fifty-one thousand, six hundred sixty-one".