55785599 has 4 divisors (see below), whose sum is σ = 55835136. Its totient is φ = 55736064.

The previous prime is 55785581. The next prime is 55785617. The reversal of 55785599 is 99558755.

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

It is an interprime number because it is at equal distance from previous prime (55785581) and next prime (55785617).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55785599 is a prime.

It is a super-2 number, since 2×55785599² = 6224066111577602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55785599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55785799) 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, 23039 + ... + 25344.

It is an arithmetic number, because the mean of its divisors is an integer number (13958784).

Almost surely, 2^55785599 is an apocalyptic number.

55785599 is a deficient number, since it is larger than the sum of its proper divisors (49537).

55785599 is a wasteful number, since it uses less digits than its factorization.

55785599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49536.

The product of its digits is 2835000, while the sum is 53.

The square root of 55785599 is about 7468.9757664622. The cubic root of 55785599 is about 382.0973569275.

The spelling of 55785599 in words is "fifty-five million, seven hundred eighty-five thousand, five hundred ninety-nine".