655980764544 has 256 divisors, whose sum is σ = 2284011417600. Its totient is φ = 181376962560.

The previous prime is 655980764533. The next prime is 655980764603. The reversal of 655980764544 is 445467089556.

655980764544 is a `hidden beast` number, since 6 + 5 + 5 + 9 + 80 + 7 + 6 + 4 + 544 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 312604 + ... + 1187300.

It is an arithmetic number, because the mean of its divisors is an integer number (8921919600).

Almost surely, 2^655980764544 is an apocalyptic number.

655980764544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655980764544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142005708800).

655980764544 is an abundant number, since it is smaller than the sum of its proper divisors (1628030653056).

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

655980764544 is a wasteful number, since it uses less digits than its factorization.

655980764544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874758 (or 874740 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 63.

The spelling of 655980764544 in words is "six hundred fifty-five billion, nine hundred eighty million, seven hundred sixty-four thousand, five hundred forty-four".