655398640000 has 320 divisors, whose sum is σ = 1786057091280. Its totient is φ = 238003200000.

The previous prime is 655398639979. The next prime is 655398640027. The reversal of 655398640000 is 46893556.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 63434835 + ... + 63445165.

Almost surely, 2^655398640000 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 655398640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893028545640).

655398640000 is an abundant number, since it is smaller than the sum of its proper divisors (1130658451280).

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

655398640000 is a wasteful number, since it uses less digits than its factorization.

655398640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439 (or 10412 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 655398640000 in words is "six hundred fifty-five billion, three hundred ninety-eight million, six hundred forty thousand".