55518883697 has 4 divisors (see below), whose sum is σ = 55519522416. Its totient is φ = 55518244980.

The previous prime is 55518883687. The next prime is 55518883699. The reversal of 55518883697 is 79638881555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79638881555 = 5 ⋅15927776311.

It is a cyclic number.

It is not a de Polignac number, because 55518883697 - 2³⁴ = 38339014513 is a prime.

It is a super-2 number, since 2×55518883697² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55518883699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163679 + ... + 371252.

It is an arithmetic number, because the mean of its divisors is an integer number (13879880604).

Almost surely, 2^55518883697 is an apocalyptic number.

It is an amenable number.

55518883697 is a deficient number, since it is larger than the sum of its proper divisors (638719).

55518883697 is a wasteful number, since it uses less digits than its factorization.

55518883697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638718.

The product of its digits is 72576000, while the sum is 65.

The spelling of 55518883697 in words is "fifty-five billion, five hundred eighteen million, eight hundred eighty-three thousand, six hundred ninety-seven".