55145605 has 12 divisors (see below), whose sum is σ = 69180300. Its totient is φ = 42196352.

The previous prime is 55145591. The next prime is 55145627. The reversal of 55145605 is 50654155.

It can be written as a sum of positive squares in 2 ways, for example, as 37429924 + 17715681 = 6118^2 + 4209^2 .

It is a de Polignac number, because none of the positive numbers 2^k-55145605 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7780 + ... + 13069.

It is an arithmetic number, because the mean of its divisors is an integer number (5765025).

Almost surely, 2^55145605 is an apocalyptic number.

It is an amenable number.

55145605 is a deficient number, since it is larger than the sum of its proper divisors (14034695).

55145605 is a wasteful number, since it uses less digits than its factorization.

55145605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20900 (or 20877 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 55145605 is about 7426.0086856938. The cubic root of 55145605 is about 380.6305436336.

The spelling of 55145605 in words is "fifty-five million, one hundred forty-five thousand, six hundred five".