51651166511099 has 4 divisors (see below), whose sum is σ = 51739158277464. Its totient is φ = 51563174744736.

The previous prime is 51651166511039. The next prime is 51651166511111. The reversal of 51651166511099 is 99011566115615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51651166511099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51651166511039) 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, 43995882302 + ... + 43995883475.

It is an arithmetic number, because the mean of its divisors is an integer number (12934789569366).

Almost surely, 2^{51651166511099} is an apocalyptic number.

51651166511099 is a deficient number, since it is larger than the sum of its proper divisors (87991766365).

51651166511099 is an equidigital number, since it uses as much as digits as its factorization.

51651166511099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87991766364.

The product of its (nonzero) digits is 2187000, while the sum is 56.

The spelling of 51651166511099 in words is "fifty-one trillion, six hundred fifty-one billion, one hundred sixty-six million, five hundred eleven thousand, ninety-nine".