55558780465 has 4 divisors (see below), whose sum is σ = 66670536564. Its totient is φ = 44447024368.

The previous prime is 55558780439. The next prime is 55558780477. The reversal of 55558780465 is 56408785555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56408785555 = 5 ⋅11281757111.

It can be written as a sum of positive squares in 2 ways, for example, as 27972228001 + 27586552464 = 167249^2 + 166092^2 .

It is a cyclic number.

It is not a de Polignac number, because 55558780465 - 2²⁵ = 55525226033 is a prime.

It is a Duffinian 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, 5555878042 + ... + 5555878051.

It is an arithmetic number, because the mean of its divisors is an integer number (16667634141).

Almost surely, 2^55558780465 is an apocalyptic number.

It is an amenable number.

55558780465 is a deficient number, since it is larger than the sum of its proper divisors (11111756099).

55558780465 is a wasteful number, since it uses less digits than its factorization.

55558780465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111756098.

The product of its (nonzero) digits is 33600000, while the sum is 58.

The spelling of 55558780465 in words is "fifty-five billion, five hundred fifty-eight million, seven hundred eighty thousand, four hundred sixty-five".