55615554 has 12 divisors (see below), whose sum is σ = 120500406. Its totient is φ = 18538512.

The previous prime is 55615537. The next prime is 55615559. The reversal of 55615554 is 45551655.

55615554 is a `hidden beast` number, since 556 + 1 + 55 + 54 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29452329 + 26163225 = 5427^2 + 5115^2 .

It is not an unprimeable number, because it can be changed into a prime (55615559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1544859 + ... + 1544894.

Almost surely, 2^55615554 is an apocalyptic number.

55615554 is an abundant number, since it is smaller than the sum of its proper divisors (64884852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55615554 is a wasteful number, since it uses less digits than its factorization.

55615554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089761 (or 3089758 counting only the distinct ones).

The product of its digits is 75000, while the sum is 36.

The square root of 55615554 is about 7457.5836569227. The cubic root of 55615554 is about 381.7087269128.

It can be divided in two parts, 55615 and 554, that added together give a square (56169 = 237²).

The spelling of 55615554 in words is "fifty-five million, six hundred fifteen thousand, five hundred fifty-four".