647771243268 has 24 divisors (see below), whose sum is σ = 1511594320320. Its totient is φ = 215905449760.

The previous prime is 647771243257. The next prime is 647771243269. The reversal of 647771243268 is 862342177746.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (647771243269) 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, 2139363 + ... + 2423306.

It is an arithmetic number, because the mean of its divisors is an integer number (62983096680).

Almost surely, 2^647771243268 is an apocalyptic number.

It is an amenable number.

647771243268 is an abundant number, since it is smaller than the sum of its proper divisors (863823077052).

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

647771243268 is a wasteful number, since it uses less digits than its factorization.

647771243268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4574507 (or 4574505 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 57.

The spelling of 647771243268 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, two hundred sixty-eight".