55601615 has 4 divisors (see below), whose sum is σ = 66721944. Its totient is φ = 44481288.

The previous prime is 55601599. The next prime is 55601647. The reversal of 55601615 is 51610655.

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

It is a cyclic number.

It is not a de Polignac number, because 55601615 - 2⁴ = 55601599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5560157 + ... + 5560166.

It is an arithmetic number, because the mean of its divisors is an integer number (16680486).

Almost surely, 2^55601615 is an apocalyptic number.

55601615 is a deficient number, since it is larger than the sum of its proper divisors (11120329).

55601615 is a wasteful number, since it uses less digits than its factorization.

55601615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11120328.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 55601615 is about 7456.6490463210. The cubic root of 55601615 is about 381.6768348602.

The spelling of 55601615 in words is "fifty-five million, six hundred one thousand, six hundred fifteen".