54777993869 has 2 divisors, whose sum is σ = 54777993870. Its totient is φ = 54777993868.

The previous prime is 54777993797. The next prime is 54777993887. The reversal of 54777993869 is 96839977745.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49706702500 + 5071291369 = 222950^2 + 71213^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54777993869 is a prime.

It is a super-2 number, since 2×54777993869² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 54777993796 and 54777993805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54777993169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27388996934 + 27388996935.

It is an arithmetic number, because the mean of its divisors is an integer number (27388996935).

Almost surely, 2^54777993869 is an apocalyptic number.

It is an amenable number.

54777993869 is a deficient number, since it is larger than the sum of its proper divisors (1).

54777993869 is an equidigital number, since it uses as much as digits as its factorization.

54777993869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720135360, while the sum is 74.

The spelling of 54777993869 in words is "fifty-four billion, seven hundred seventy-seven million, nine hundred ninety-three thousand, eight hundred sixty-nine".