647581780992 has 66 divisors (see below), whose sum is σ = 1726160433628. Its totient is φ = 215845726208.

The previous prime is 647581780933. The next prime is 647581780999. The reversal of 647581780992 is 299087185746.

It is not an unprimeable number, because it can be changed into a prime (647581780999) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44595109 + ... + 44609627.

Almost surely, 2^647581780992 is an apocalyptic number.

It is an amenable number.

647581780992 is an abundant number, since it is smaller than the sum of its proper divisors (1078578652636).

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

647581780992 is an frugal number, since it uses more digits than its factorization.

647581780992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29061 (or 14524 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 66.

The spelling of 647581780992 in words is "six hundred forty-seven billion, five hundred eighty-one million, seven hundred eighty thousand, nine hundred ninety-two".