656620780000 has 120 divisors (see below), whose sum is σ = 1638141064560. Its totient is φ = 258948480000.

The previous prime is 656620779989. The next prime is 656620780003. The reversal of 656620780000 is 87026656.

656620780000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656620780003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1188796 + ... + 1651204.

It is an arithmetic number, because the mean of its divisors is an integer number (13651175538).

Almost surely, 2^656620780000 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 656620780000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819070532280).

656620780000 is an abundant number, since it is smaller than the sum of its proper divisors (981520284560).

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

656620780000 is an equidigital number, since it uses as much as digits as its factorization.

656620780000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462510 (or 462487 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 656620780000 in words is "six hundred fifty-six billion, six hundred twenty million, seven hundred eighty thousand".