51261540751 has 8 divisors (see below), whose sum is σ = 54698689520. Its totient is φ = 47898309312.

The previous prime is 51261540749. The next prime is 51261540763. The reversal of 51261540751 is 15704516215.

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

It is not a de Polignac number, because 51261540751 - 2¹ = 51261540749 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 51261540751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261549751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18477900 + ... + 18480673.

It is an arithmetic number, because the mean of its divisors is an integer number (6837336190).

Almost surely, 2^51261540751 is an apocalyptic number.

51261540751 is a deficient number, since it is larger than the sum of its proper divisors (3437148769).

51261540751 is a wasteful number, since it uses less digits than its factorization.

51261540751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36958665.

The product of its (nonzero) digits is 42000, while the sum is 37.

The spelling of 51261540751 in words is "fifty-one billion, two hundred sixty-one million, five hundred forty thousand, seven hundred fifty-one".