51261008465 has 8 divisors (see below), whose sum is σ = 61962212520. Its totient is φ = 40709471872.

The previous prime is 51261008419. The next prime is 51261008501. The reversal of 51261008465 is 56480016215.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8196043024 + 43064965441 = 90532^2 + 207521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51261008465 - 2¹² = 51261004369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37416110 + ... + 37417479.

It is an arithmetic number, because the mean of its divisors is an integer number (7745276565).

Almost surely, 2^51261008465 is an apocalyptic number.

It is an amenable number.

51261008465 is a deficient number, since it is larger than the sum of its proper divisors (10701204055).

51261008465 is a wasteful number, since it uses less digits than its factorization.

51261008465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74833731.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 51261008465 in words is "fifty-one billion, two hundred sixty-one million, eight thousand, four hundred sixty-five".