51630131121261 has 32 divisors (see below), whose sum is σ = 88786253260800. Its totient is φ = 25895990527680.

The previous prime is 51630131121229. The next prime is 51630131121277. The reversal of 51630131121261 is 16212113103615.

It is a happy number.

It is not a de Polignac number, because 51630131121261 - 2⁵ = 51630131121229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51630131126261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3853563321 + ... + 3853576718.

It is an arithmetic number, because the mean of its divisors is an integer number (2774570414400).

Almost surely, 2^{51630131121261} is an apocalyptic number.

It is an amenable number.

51630131121261 is a deficient number, since it is larger than the sum of its proper divisors (37156122139539).

51630131121261 is a wasteful number, since it uses less digits than its factorization.

51630131121261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7707140089.

The product of its (nonzero) digits is 6480, while the sum is 33.

Adding to 51630131121261 its reverse (16212113103615), we get a palindrome (67842244224876).

The spelling of 51630131121261 in words is "fifty-one trillion, six hundred thirty billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred sixty-one".