51000042545 has 4 divisors (see below), whose sum is σ = 61200051060. Its totient is φ = 40800034032.

The previous prime is 51000042539. The next prime is 51000042601. The reversal of 51000042545 is 54524000015.

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 33450946816 + 17549095729 = 182896^2 + 132473^2 .

It is a cyclic number.

It is not a de Polignac number, because 51000042545 - 2¹⁸ = 50999780401 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, 5100004250 + ... + 5100004259.

It is an arithmetic number, because the mean of its divisors is an integer number (15300012765).

Almost surely, 2^51000042545 is an apocalyptic number.

It is an amenable number.

51000042545 is a deficient number, since it is larger than the sum of its proper divisors (10200008515).

51000042545 is a wasteful number, since it uses less digits than its factorization.

51000042545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200008514.

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 51000042545 in words is "fifty-one billion, forty-two thousand, five hundred forty-five".