51005455551 has 12 divisors (see below), whose sum is σ = 73909932928. Its totient is φ = 33894997344.

The previous prime is 51005455517. The next prime is 51005455561. The reversal of 51005455551 is 15555450015.

51005455551 is a `hidden beast` number, since 5 + 1 + 0 + 0 + 54 + 55 + 551 = 666.

It is not a de Polignac number, because 51005455551 - 2¹³ = 51005447359 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 (51005455511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9050335 + ... + 9055968.

Almost surely, 2^51005455551 is an apocalyptic number.

51005455551 is a deficient number, since it is larger than the sum of its proper divisors (22904477377).

51005455551 is a wasteful number, since it uses less digits than its factorization.

51005455551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18106622 (or 18106619 counting only the distinct ones).

The product of its (nonzero) digits is 62500, while the sum is 36.

The spelling of 51005455551 in words is "fifty-one billion, five million, four hundred fifty-five thousand, five hundred fifty-one".