23501003551 has 4 divisors (see below), whose sum is σ = 23503852512. Its totient is φ = 23498154592.

The previous prime is 23501003527. The next prime is 23501003563. The reversal of 23501003551 is 15530010532.

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 23501003551 - 2¹⁵ = 23500970783 is a prime.

It is a super-2 number, since 2×23501003551² (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 (23501003501) 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, 1412071 + ... + 1428616.

It is an arithmetic number, because the mean of its divisors is an integer number (5875963128).

Almost surely, 2^23501003551 is an apocalyptic number.

23501003551 is a deficient number, since it is larger than the sum of its proper divisors (2848961).

23501003551 is an equidigital number, since it uses as much as digits as its factorization.

23501003551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848960.

The product of its (nonzero) digits is 2250, while the sum is 25.

The spelling of 23501003551 in words is "twenty-three billion, five hundred one million, three thousand, five hundred fifty-one".