51056404145 has 4 divisors (see below), whose sum is σ = 61267684980. Its totient is φ = 40845123312.

The previous prime is 51056404129. The next prime is 51056404151. The reversal of 51056404145 is 54140465015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6858489856 + 44197914289 = 82816^2 + 210233^2 .

It is a cyclic number.

It is not a de Polignac number, because 51056404145 - 2⁴ = 51056404129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5105640410 + ... + 5105640419.

It is an arithmetic number, because the mean of its divisors is an integer number (15316921245).

Almost surely, 2^51056404145 is an apocalyptic number.

It is an amenable number.

51056404145 is a deficient number, since it is larger than the sum of its proper divisors (10211280835).

51056404145 is a wasteful number, since it uses less digits than its factorization.

51056404145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10211280834.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 51056404145 in words is "fifty-one billion, fifty-six million, four hundred four thousand, one hundred forty-five".