51771291640 has 32 divisors (see below), whose sum is σ = 116626333680. Its totient is φ = 20683462912.

The previous prime is 51771291623. The next prime is 51771291643. The reversal of 51771291640 is 4619217715.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51771291643) 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, 749437 + ... + 815596.

Almost surely, 2^51771291640 is an apocalyptic number.

It is an amenable number.

51771291640 is an abundant number, since it is smaller than the sum of its proper divisors (64855042040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51771291640 is a wasteful number, since it uses less digits than its factorization.

51771291640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565871 (or 1565867 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 43.

The spelling of 51771291640 in words is "fifty-one billion, seven hundred seventy-one million, two hundred ninety-one thousand, six hundred forty".