655919078400 has 1320 divisors, whose sum is σ = 2686789686240. Its totient is φ = 157270671360.

The previous prime is 655919078371. The next prime is 655919078443. The reversal of 655919078400 is 4870919556.

655919078400 is a `hidden beast` number, since 6 + 5 + 591 + 9 + 0 + 7 + 8 + 40 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 810777196 + ... + 810778004.

It is an arithmetic number, because the mean of its divisors is an integer number (2035446732).

Almost surely, 2^655919078400 is an apocalyptic number.

655919078400 is a gapful number since it is divisible by the number (60) 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 655919078400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1343394843120).

655919078400 is an abundant number, since it is smaller than the sum of its proper divisors (2030870607840).

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

655919078400 is a wasteful number, since it uses less digits than its factorization.

655919078400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 655919078400 in words is "six hundred fifty-five billion, nine hundred nineteen million, seventy-eight thousand, four hundred".