55555555499945 has 4 divisors (see below), whose sum is σ = 66666666599940. Its totient is φ = 44444444399952.

The previous prime is 55555555499923. The next prime is 55555555499971. The reversal of 55555555499945 is 54999455555555.

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 18455237953936 + 37100317546009 = 4295956^2 + 6091003^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555555499945 - 2⁶ = 55555555499881 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55555555499945.

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, 5555555549990 + ... + 5555555549999.

It is an arithmetic number, because the mean of its divisors is an integer number (16666666649985).

Almost surely, 2^{55555555499945} is an apocalyptic number.

It is an amenable number.

55555555499945 is a deficient number, since it is larger than the sum of its proper divisors (11111111099995).

55555555499945 is a wasteful number, since it uses less digits than its factorization.

55555555499945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11111111099994.

The product of its digits is 22781250000, while the sum is 80.

The spelling of 55555555499945 in words is "fifty-five trillion, five hundred fifty-five billion, five hundred fifty-five million, four hundred ninety-nine thousand, nine hundred forty-five".