655561651 has 4 divisors (see below), whose sum is σ = 655614432. Its totient is φ = 655508872.

The previous prime is 655561649. The next prime is 655561691. The reversal of 655561651 is 156165556.

655561651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 655561651 - 2¹ = 655561649 is a prime.

It is a super-2 number, since 2×655561651² = 859522156523691602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655561601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3606 + ... + 36388.

It is an arithmetic number, because the mean of its divisors is an integer number (163903608).

Almost surely, 2^655561651 is an apocalyptic number.

655561651 is a deficient number, since it is larger than the sum of its proper divisors (52781).

655561651 is a wasteful number, since it uses less digits than its factorization.

655561651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52780.

The product of its digits is 135000, while the sum is 40.

The square root of 655561651 is about 25603.9381931765. The cubic root of 655561651 is about 868.7027175343.

The spelling of 655561651 in words is "six hundred fifty-five million, five hundred sixty-one thousand, six hundred fifty-one".