655561501 has 16 divisors (see below), whose sum is σ = 782317440. Its totient is φ = 537445440.

The previous prime is 655561483. The next prime is 655561601. The reversal of 655561501 is 105165556.

It is not a de Polignac number, because 655561501 - 2⁷ = 655561373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655561001) 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, 6631 + ... + 36811.

It is an arithmetic number, because the mean of its divisors is an integer number (48894840).

Almost surely, 2^655561501 is an apocalyptic number.

It is an amenable number.

655561501 is a deficient number, since it is larger than the sum of its proper divisors (126755939).

655561501 is a wasteful number, since it uses less digits than its factorization.

655561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30324.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 655561501 is about 25603.9352639394. The cubic root of 655561501 is about 868.7026512779.

The spelling of 655561501 in words is "six hundred fifty-five million, five hundred sixty-one thousand, five hundred one".