647267991552 has 720 divisors, whose sum is σ = 2403530226720. Its totient is φ = 170633723904.

The previous prime is 647267991551. The next prime is 647267991553. The reversal of 647267991552 is 255199762746.

647267991552 is a `hidden beast` number, since 6 + 4 + 7 + 2 + 6 + 79 + 9 + 1 + 552 = 666.

It is an interprime number because it is at equal distance from previous prime (647267991551) and next prime (647267991553).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 647267991552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647267991551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 281787268 + ... + 281789564.

It is an arithmetic number, because the mean of its divisors is an integer number (3338236426).

Almost surely, 2^647267991552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647267991552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201765113360).

647267991552 is an abundant number, since it is smaller than the sum of its proper divisors (1756262235168).

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

647267991552 is a wasteful number, since it uses less digits than its factorization.

647267991552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361 (or 2322 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 63.

The spelling of 647267991552 in words is "six hundred forty-seven billion, two hundred sixty-seven million, nine hundred ninety-one thousand, five hundred fifty-two".