51105511499 has 4 divisors (see below), whose sum is σ = 58406298864. Its totient is φ = 43804724136.

The previous prime is 51105511489. The next prime is 51105511519. The reversal of 51105511499 is 99411550115.

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 51105511499 - 2²⁰ = 51104462923 is a prime.

It is a super-2 number, since 2×51105511499² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51105511489) 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, 3650393672 + ... + 3650393685.

It is an arithmetic number, because the mean of its divisors is an integer number (14601574716).

Almost surely, 2^51105511499 is an apocalyptic number.

51105511499 is a deficient number, since it is larger than the sum of its proper divisors (7300787365).

51105511499 is an equidigital number, since it uses as much as digits as its factorization.

51105511499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300787364.

The product of its (nonzero) digits is 40500, while the sum is 41.

The spelling of 51105511499 in words is "fifty-one billion, one hundred five million, five hundred eleven thousand, four hundred ninety-nine".