55511055997 has 4 divisors (see below), whose sum is σ = 55700513820. Its totient is φ = 55321598176.

The previous prime is 55511055907. The next prime is 55511056001. The reversal of 55511055997 is 79955011555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79955011555 = 5 ⋅15991002311.

It can be written as a sum of positive squares in 2 ways, for example, as 44924498116 + 10586557881 = 211954^2 + 102891^2 .

It is a cyclic number.

It is not a de Polignac number, because 55511055997 - 2⁷ = 55511055869 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 (55511055907) 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, 94728472 + ... + 94729057.

It is an arithmetic number, because the mean of its divisors is an integer number (13925128455).

Almost surely, 2^55511055997 is an apocalyptic number.

It is an amenable number.

55511055997 is a deficient number, since it is larger than the sum of its proper divisors (189457823).

55511055997 is a wasteful number, since it uses less digits than its factorization.

55511055997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189457822.

The product of its (nonzero) digits is 1771875, while the sum is 52.

The spelling of 55511055997 in words is "fifty-five billion, five hundred eleven million, fifty-five thousand, nine hundred ninety-seven".