51902615696409 has 15 divisors (see below), whose sum is σ = 77533633886533. Its totient is φ = 34601700571524.

The previous prime is 51902615696401. The next prime is 51902615696429. The reversal of 51902615696409 is 90469651620915.

The square root of 51902615696409 is 7204347.

It is a perfect power (a square), and thus also a powerful number.

51902615696409 is a `hidden beast` number, since 5 + 1 + 9 + 0 + 2 + 6 + 1 + 569 + 64 + 0 + 9 = 666.

It is not a de Polignac number, because 51902615696409 - 2³ = 51902615696401 is a prime.

It is a super-2 number, since 2×51902615696409² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51902615696401) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 64438882 + ... + 65239364.

Almost surely, 2^{51902615696409} is an apocalyptic number.

51902615696409 is the 7204347-th square number.

51902615696409 is the 3602174-th centered octagonal number.

It is an amenable number.

51902615696409 is a deficient number, since it is larger than the sum of its proper divisors (25631018190124).

51902615696409 is an frugal number, since it uses more digits than its factorization.

51902615696409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600978 (or 800486 counting only the distinct ones).

The product of its (nonzero) digits is 31492800, while the sum is 63.

The spelling of 51902615696409 in words is "fifty-one trillion, nine hundred two billion, six hundred fifteen million, six hundred ninety-six thousand, four hundred nine".