51640907722 has 8 divisors (see below), whose sum is σ = 77469192900. Its totient is φ = 25817843424.

The previous prime is 51640907687. The next prime is 51640907729. The reversal of 51640907722 is 22770904615.

It can be written as a sum of positive squares in 2 ways, for example, as 50073460441 + 1567447281 = 223771^2 + 39591^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51640907729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280397 + ... + 1320112.

Almost surely, 2^51640907722 is an apocalyptic number.

51640907722 is a deficient number, since it is larger than the sum of its proper divisors (25828285178).

51640907722 is a wasteful number, since it uses less digits than its factorization.

51640907722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610440.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 51640907722 in words is "fifty-one billion, six hundred forty million, nine hundred seven thousand, seven hundred twenty-two".