640579467716 has 6 divisors (see below), whose sum is σ = 1121014068510. Its totient is φ = 320289733856.

The previous prime is 640579467653. The next prime is 640579467733. The reversal of 640579467716 is 617764975046.

It can be written as a sum of positive squares in only one way, i.e., 456778629316 + 183800838400 = 675854^2 + 428720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80072433461 + ... + 80072433468.

It is an arithmetic number, because the mean of its divisors is an integer number (186835678085).

Almost surely, 2^640579467716 is an apocalyptic number.

It is an amenable number.

640579467716 is a deficient number, since it is larger than the sum of its proper divisors (480434600794).

640579467716 is a wasteful number, since it uses less digits than its factorization.

640579467716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160144866933 (or 160144866931 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 62.

The spelling of 640579467716 in words is "six hundred forty billion, five hundred seventy-nine million, four hundred sixty-seven thousand, seven hundred sixteen".