55511599 has 16 divisors (see below), whose sum is σ = 65630880. Its totient is φ = 46562880.

The previous prime is 55511587. The next prime is 55511611. The reversal of 55511599 is 99511555.

It is an interprime number because it is at equal distance from previous prime (55511587) and next prime (55511611).

It is not a de Polignac number, because 55511599 - 2⁷ = 55511471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55511509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23019 + ... + 25315.

It is an arithmetic number, because the mean of its divisors is an integer number (4101930).

Almost surely, 2^55511599 is an apocalyptic number.

55511599 is a deficient number, since it is larger than the sum of its proper divisors (10119281).

55511599 is a wasteful number, since it uses less digits than its factorization.

55511599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347 (or 2321 counting only the distinct ones).

The product of its digits is 50625, while the sum is 40.

The square root of 55511599 is about 7450.6106461149. The cubic root of 55511599 is about 381.4707522409.

The spelling of 55511599 in words is "fifty-five million, five hundred eleven thousand, five hundred ninety-nine".