55615057 has 4 divisors (see below), whose sum is σ = 55831716. Its totient is φ = 55398400.

The previous prime is 55615051. The next prime is 55615067. The reversal of 55615057 is 75051655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47458321 + 8156736 = 6889^2 + 2856^2 .

It is a cyclic number.

It is not a de Polignac number, because 55615057 - 2¹¹ = 55613009 is a prime.

It is a super-2 number, since 2×55615057² = 6186069130226498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55615051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107944 + ... + 108457.

It is an arithmetic number, because the mean of its divisors is an integer number (13957929).

Almost surely, 2^55615057 is an apocalyptic number.

It is an amenable number.

55615057 is a deficient number, since it is larger than the sum of its proper divisors (216659).

55615057 is a wasteful number, since it uses less digits than its factorization.

55615057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216658.

The product of its (nonzero) digits is 26250, while the sum is 34.

The square root of 55615057 is about 7457.5503350631. The cubic root of 55615057 is about 381.7075898819.

The spelling of 55615057 in words is "fifty-five million, six hundred fifteen thousand, fifty-seven".