655556649 has 16 divisors (see below), whose sum is σ = 994996224. Its totient is φ = 380032400.

The previous prime is 655556647. The next prime is 655556651. The reversal of 655556649 is 946655556.

It is an interprime number because it is at equal distance from previous prime (655556647) and next prime (655556651).

It is not a de Polignac number, because 655556649 - 2¹ = 655556647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (655556647) 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, 431097 + ... + 432614.

It is an arithmetic number, because the mean of its divisors is an integer number (62187264).

Almost surely, 2^655556649 is an apocalyptic number.

655556649 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

655556649 is a deficient number, since it is larger than the sum of its proper divisors (339439575).

655556649 is a wasteful number, since it uses less digits than its factorization.

655556649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863748.

The product of its digits is 4860000, while the sum is 51.

The square root of 655556649 is about 25603.8405127043. The cubic root of 655556649 is about 868.7005080996.

The spelling of 655556649 in words is "six hundred fifty-five million, five hundred fifty-six thousand, six hundred forty-nine".