51020402045 has 16 divisors (see below), whose sum is σ = 63093870000. Its totient is φ = 39577595904.

The previous prime is 51020402039. The next prime is 51020402053. The reversal of 51020402045 is 54020402015.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 24105046564 + 26915355481 = 155258^2 + 164059^2 .

It is a cyclic number.

It is not a de Polignac number, because 51020402045 - 2¹² = 51020397949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51020402045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416420 + ... + 524829.

It is an arithmetic number, because the mean of its divisors is an integer number (3943366875).

Almost surely, 2^51020402045 is an apocalyptic number.

It is an amenable number.

51020402045 is a deficient number, since it is larger than the sum of its proper divisors (12073467955).

51020402045 is a wasteful number, since it uses less digits than its factorization.

51020402045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941584.

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 51020402045 in words is "fifty-one billion, twenty million, four hundred two thousand, forty-five".