51131537645 has 8 divisors (see below), whose sum is σ = 61734274656. Its totient is φ = 40654277136.

The previous prime is 51131537603. The next prime is 51131537663. The reversal of 51131537645 is 54673513115.

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 51131537645 - 2¹² = 51131533549 is a prime.

It is a super-3 number, since 3×51131537645³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31368227 + ... + 31369856.

It is an arithmetic number, because the mean of its divisors is an integer number (7716784332).

Almost surely, 2^51131537645 is an apocalyptic number.

It is an amenable number.

51131537645 is a deficient number, since it is larger than the sum of its proper divisors (10602737011).

51131537645 is a wasteful number, since it uses less digits than its factorization.

51131537645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62738251.

The product of its digits is 189000, while the sum is 41.

The spelling of 51131537645 in words is "fifty-one billion, one hundred thirty-one million, five hundred thirty-seven thousand, six hundred forty-five".