54111221551 has 16 divisors (see below), whose sum is σ = 57933308160. Its totient is φ = 50390847360.

The previous prime is 54111221537. The next prime is 54111221579. The reversal of 54111221551 is 15512211145.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54111221551 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 (54111221501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395100 + ... + 514126.

It is an arithmetic number, because the mean of its divisors is an integer number (3620831760).

Almost surely, 2^54111221551 is an apocalyptic number.

54111221551 is a deficient number, since it is larger than the sum of its proper divisors (3822086609).

54111221551 is a wasteful number, since it uses less digits than its factorization.

54111221551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119454.

The product of its digits is 2000, while the sum is 28.

Adding to 54111221551 its reverse (15512211145), we get a palindrome (69623432696).

The spelling of 54111221551 in words is "fifty-four billion, one hundred eleven million, two hundred twenty-one thousand, five hundred fifty-one".