647771177660 has 48 divisors (see below), whose sum is σ = 1377011887776. Its totient is φ = 255930339072.

The previous prime is 647771177629. The next prime is 647771177689. The reversal of 647771177660 is 66771177746.

647771177660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 647771177660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7949042 + ... + 8030118.

It is an arithmetic number, because the mean of its divisors is an integer number (28687747662).

Almost surely, 2^647771177660 is an apocalyptic number.

It is an amenable number.

647771177660 is an abundant number, since it is smaller than the sum of its proper divisors (729240710116).

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

647771177660 is a wasteful number, since it uses less digits than its factorization.

647771177660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85982 (or 85980 counting only the distinct ones).

The product of its (nonzero) digits is 14521248, while the sum is 59.

The spelling of 647771177660 in words is "six hundred forty-seven billion, seven hundred seventy-one million, one hundred seventy-seven thousand, six hundred sixty".