20112551551 has 8 divisors (see below), whose sum is σ = 20583094400. Its totient is φ = 19642136472.

The previous prime is 20112551531. The next prime is 20112551609. The reversal of 20112551551 is 15515521102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112551551 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 (20112551521) 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, 335350 + ... + 390748.

It is an arithmetic number, because the mean of its divisors is an integer number (2572886800).

Almost surely, 2^20112551551 is an apocalyptic number.

20112551551 is a deficient number, since it is larger than the sum of its proper divisors (470542849).

20112551551 is an equidigital number, since it uses as much as digits as its factorization.

20112551551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63885.

The product of its (nonzero) digits is 2500, while the sum is 28.

The spelling of 20112551551 in words is "twenty billion, one hundred twelve million, five hundred fifty-one thousand, five hundred fifty-one".