651779424871 has 4 divisors (see below), whose sum is σ = 651789486232. Its totient is φ = 651769363512.

The previous prime is 651779424853. The next prime is 651779424887. The reversal of 651779424871 is 178424977156.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 651779424871 - 2²⁵ = 651745870439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651779424851) 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, 4932876 + ... + 5063281.

It is an arithmetic number, because the mean of its divisors is an integer number (162947371558).

Almost surely, 2^651779424871 is an apocalyptic number.

651779424871 is a deficient number, since it is larger than the sum of its proper divisors (10061361).

651779424871 is an equidigital number, since it uses as much as digits as its factorization.

651779424871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061360.

The product of its digits is 23708160, while the sum is 61.

The spelling of 651779424871 in words is "six hundred fifty-one billion, seven hundred seventy-nine million, four hundred twenty-four thousand, eight hundred seventy-one".