54897777221 has 24 divisors (see below), whose sum is σ = 67538352960. Its totient is φ = 43560910080.

The previous prime is 54897777197. The next prime is 54897777283. The reversal of 54897777221 is 12277779845.

It is a happy number.

It is not a de Polignac number, because 54897777221 - 2⁶ = 54897777157 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 (54897777721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 380810 + ... + 504788.

It is an arithmetic number, because the mean of its divisors is an integer number (2814098040).

Almost surely, 2^54897777221 is an apocalyptic number.

It is an amenable number.

54897777221 is a deficient number, since it is larger than the sum of its proper divisors (12640575739).

54897777221 is a wasteful number, since it uses less digits than its factorization.

54897777221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124125 (or 124064 counting only the distinct ones).

The product of its digits is 13829760, while the sum is 59.

The spelling of 54897777221 in words is "fifty-four billion, eight hundred ninety-seven million, seven hundred seventy-seven thousand, two hundred twenty-one".