655121456 has 80 divisors (see below), whose sum is σ = 1420742400. Its totient is φ = 290131200.

The previous prime is 655121449. The next prime is 655121471. The reversal of 655121456 is 654121556.

It is a super-2 number, since 2×655121456² = 858368244223119872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1492085 + ... + 1492523.

It is an arithmetic number, because the mean of its divisors is an integer number (17759280).

Almost surely, 2^655121456 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 655121456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710371200).

655121456 is an abundant number, since it is smaller than the sum of its proper divisors (765620944).

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

655121456 is a wasteful number, since it uses less digits than its factorization.

655121456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 652 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 655121456 is about 25595.3405134606. The cubic root of 655121456 is about 868.5082358433.

The spelling of 655121456 in words is "six hundred fifty-five million, one hundred twenty-one thousand, four hundred fifty-six".