55520657 has 6 divisors (see below), whose sum is σ = 58978998. Its totient is φ = 52254464.

The previous prime is 55520639. The next prime is 55520669. The reversal of 55520657 is 75602555.

It can be written as a sum of positive squares in 3 ways, for example, as 35414401 + 20106256 = 5951^2 + 4484^2 .

It is not a de Polignac number, because 55520657 - 2⁸ = 55520401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55520687) 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, 95768 + ... + 96345.

It is an arithmetic number, because the mean of its divisors is an integer number (9829833).

Almost surely, 2^55520657 is an apocalyptic number.

It is an amenable number.

55520657 is a deficient number, since it is larger than the sum of its proper divisors (3458341).

55520657 is a wasteful number, since it uses less digits than its factorization.

55520657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192147 (or 192130 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 35.

The square root of 55520657 is about 7451.2184909584. The cubic root of 55520657 is about 381.4914997015.

It can be divided in two parts, 555 and 20657, that added together give a palindrome (21212).

The spelling of 55520657 in words is "fifty-five million, five hundred twenty thousand, six hundred fifty-seven".