655661501 has 16 divisors (see below), whose sum is σ = 739696128. Its totient is φ = 575769600.

The previous prime is 655661477. The next prime is 655661533. The reversal of 655661501 is 105166556.

It is a cyclic number.

It is not a de Polignac number, because 655661501 - 2²⁶ = 588552637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655661581) 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, 228065 + ... + 230921.

It is an arithmetic number, because the mean of its divisors is an integer number (46231008).

Almost surely, 2^655661501 is an apocalyptic number.

It is an amenable number.

655661501 is a deficient number, since it is larger than the sum of its proper divisors (84034627).

655661501 is a wasteful number, since it uses less digits than its factorization.

655661501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3572.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 655661501 is about 25605.8880142830. Note that the first 3 decimals coincide. The cubic root of 655661501 is about 868.7468199528.

The spelling of 655661501 in words is "six hundred fifty-five million, six hundred sixty-one thousand, five hundred one".