51455910109 has 4 divisors (see below), whose sum is σ = 53693123616. Its totient is φ = 49218696604.

The previous prime is 51455910091. The next prime is 51455910173. The reversal of 51455910109 is 90101955415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51455910109 - 2¹¹ = 51455908061 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51455910179) 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, 1118606719 + ... + 1118606764.

It is an arithmetic number, because the mean of its divisors is an integer number (13423280904).

Almost surely, 2^51455910109 is an apocalyptic number.

It is an amenable number.

51455910109 is a deficient number, since it is larger than the sum of its proper divisors (2237213507).

51455910109 is a wasteful number, since it uses less digits than its factorization.

51455910109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2237213506.

The product of its (nonzero) digits is 40500, while the sum is 40.

The spelling of 51455910109 in words is "fifty-one billion, four hundred fifty-five million, nine hundred ten thousand, one hundred nine".