5251561495489 has 4 divisors (see below), whose sum is σ = 5285010931924. Its totient is φ = 5218112059056.

The previous prime is 5251561495451. The next prime is 5251561495519. The reversal of 5251561495489 is 9845941651525.

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 2563329081600 + 2688232413889 = 1601040^2 + 1639583^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251561495489 - 2¹⁷ = 5251561364417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5251561495489.

It is not an unprimeable number, because it can be changed into a prime (5251561495889) 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, 16724717982 + ... + 16724718295.

It is an arithmetic number, because the mean of its divisors is an integer number (1321252732981).

Almost surely, 2^{5251561495489} is an apocalyptic number.

It is an amenable number.

5251561495489 is a deficient number, since it is larger than the sum of its proper divisors (33449436435).

5251561495489 is a wasteful number, since it uses less digits than its factorization.

5251561495489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33449436434.

The product of its digits is 77760000, while the sum is 64.

The spelling of 5251561495489 in words is "five trillion, two hundred fifty-one billion, five hundred sixty-one million, four hundred ninety-five thousand, four hundred eighty-nine".