23500820551 has 4 divisors (see below), whose sum is σ = 25308575992. Its totient is φ = 21693065112.

The previous prime is 23500820543. The next prime is 23500820599. The reversal of 23500820551 is 15502800532.

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

It is a cyclic number.

It is not a de Polignac number, because 23500820551 - 2³ = 23500820543 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 (23500620551) 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, 903877701 + ... + 903877726.

It is an arithmetic number, because the mean of its divisors is an integer number (6327143998).

Almost surely, 2^23500820551 is an apocalyptic number.

23500820551 is a deficient number, since it is larger than the sum of its proper divisors (1807755441).

23500820551 is a wasteful number, since it uses less digits than its factorization.

23500820551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807755440.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 23500820551 in words is "twenty-three billion, five hundred million, eight hundred twenty thousand, five hundred fifty-one".