5555555555491 has 48 divisors (see below), whose sum is σ = 5902094499840. Its totient is φ = 5228440842240.

The previous prime is 5555555555441. The next prime is 5555555555507. The reversal of 5555555555491 is 1945555555555.

It is a de Polignac number, because none of the positive numbers 2^k-5555555555491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555555555401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7224389155 + ... + 7224389923.

It is an arithmetic number, because the mean of its divisors is an integer number (122960302080).

Almost surely, 2^{5555555555491} is an apocalyptic number.

5555555555491 is a deficient number, since it is larger than the sum of its proper divisors (346538944349).

5555555555491 is a wasteful number, since it uses less digits than its factorization.

5555555555491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696 (or 1673 counting only the distinct ones).

The product of its digits is 351562500, while the sum is 64.

Adding to 5555555555491 its sum of digits (64), we get a palindrome (5555555555555).

The spelling of 5555555555491 in words is "five trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, four hundred ninety-one".