655600981 has 16 divisors (see below), whose sum is σ = 766168704. Its totient is φ = 549402624.

The previous prime is 655600951. The next prime is 655600991. The reversal of 655600981 is 189006556.

It is a cyclic number.

It is not a de Polignac number, because 655600981 - 2⁵ = 655600949 is a prime.

It is a super-2 number, since 2×655600981² = 859625292576324722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655600921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50541 + ... + 62173.

It is an arithmetic number, because the mean of its divisors is an integer number (47885544).

Almost surely, 2^655600981 is an apocalyptic number.

It is an amenable number.

655600981 is a deficient number, since it is larger than the sum of its proper divisors (110567723).

655600981 is a wasteful number, since it uses less digits than its factorization.

655600981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11820.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 655600981 is about 25604.7062275668. The cubic root of 655600981 is about 868.7200896074.

The spelling of 655600981 in words is "six hundred fifty-five million, six hundred thousand, nine hundred eighty-one".