55536561 has 12 divisors (see below), whose sum is σ = 80512692. Its totient is φ = 36889056.

The previous prime is 55536541. The next prime is 55536571. The reversal of 55536561 is 16563555.

It can be written as a sum of positive squares in 2 ways, for example, as 28037025 + 27499536 = 5295^2 + 5244^2 .

It is not a de Polignac number, because 55536561 - 2¹⁹ = 55012273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55536541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8646 + ... + 13631.

It is an arithmetic number, because the mean of its divisors is an integer number (6709391).

Almost surely, 2^55536561 is an apocalyptic number.

It is an amenable number.

55536561 is a deficient number, since it is larger than the sum of its proper divisors (24976131).

55536561 is a wasteful number, since it uses less digits than its factorization.

55536561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22560 (or 22557 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 55536561 is about 7452.2856225456. The cubic root of 55536561 is about 381.5279225509.

The spelling of 55536561 in words is "fifty-five million, five hundred thirty-six thousand, five hundred sixty-one".