55521425 has 24 divisors (see below), whose sum is σ = 72328704. Its totient is φ = 42197760.

The previous prime is 55521377. The next prime is 55521443. The reversal of 55521425 is 52412555.

It is not a de Polignac number, because 55521425 - 2¹⁰ = 55520401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128009 + ... + 128441.

It is an arithmetic number, because the mean of its divisors is an integer number (3013696).

Almost surely, 2^55521425 is an apocalyptic number.

It is an amenable number.

55521425 is a deficient number, since it is larger than the sum of its proper divisors (16807279).

55521425 is a wasteful number, since it uses less digits than its factorization.

55521425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 684 counting only the distinct ones).

The product of its digits is 10000, while the sum is 29.

The square root of 55521425 is about 7451.2700259754. The cubic root of 55521425 is about 381.4932587112.

The spelling of 55521425 in words is "fifty-five million, five hundred twenty-one thousand, four hundred twenty-five".