51254740465 has 4 divisors (see below), whose sum is σ = 61505688564. Its totient is φ = 41003792368.

The previous prime is 51254740451. The next prime is 51254740483. The reversal of 51254740465 is 56404745215.

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 7343118864 + 43911621601 = 85692^2 + 209551^2 .

It is a cyclic number.

It is not a de Polignac number, because 51254740465 - 2⁹ = 51254739953 is a prime.

It is a Duffinian number.

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, 5125474042 + ... + 5125474051.

It is an arithmetic number, because the mean of its divisors is an integer number (15376422141).

Almost surely, 2^51254740465 is an apocalyptic number.

It is an amenable number.

51254740465 is a deficient number, since it is larger than the sum of its proper divisors (10250948099).

51254740465 is a wasteful number, since it uses less digits than its factorization.

51254740465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250948098.

The product of its (nonzero) digits is 672000, while the sum is 43.

The spelling of 51254740465 in words is "fifty-one billion, two hundred fifty-four million, seven hundred forty thousand, four hundred sixty-five".