20016055551 has 4 divisors (see below), whose sum is σ = 26688074072. Its totient is φ = 13344037032.

The previous prime is 20016055547. The next prime is 20016055559. The reversal of 20016055551 is 15555061002.

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

It is not a de Polignac number, because 20016055551 - 2² = 20016055547 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 (20016055559) 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, 3336009256 + ... + 3336009261.

It is an arithmetic number, because the mean of its divisors is an integer number (6672018518).

Almost surely, 2^20016055551 is an apocalyptic number.

20016055551 is a deficient number, since it is larger than the sum of its proper divisors (6672018521).

20016055551 is an equidigital number, since it uses as much as digits as its factorization.

20016055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672018520.

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 20016055551 in words is "twenty billion, sixteen million, fifty-five thousand, five hundred fifty-one".