55777557739 has 2 divisors, whose sum is σ = 55777557740. Its totient is φ = 55777557738.

The previous prime is 55777557721. The next prime is 55777557749. The reversal of 55777557739 is 93775577755.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55777557739 is a prime.

It is a super-2 number, since 2×55777557739² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55777557749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27888778869 + 27888778870.

It is an arithmetic number, because the mean of its divisors is an integer number (27888778870).

Almost surely, 2^55777557739 is an apocalyptic number.

55777557739 is a deficient number, since it is larger than the sum of its proper divisors (1).

55777557739 is an equidigital number, since it uses as much as digits as its factorization.

55777557739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283618125, while the sum is 67.

The spelling of 55777557739 in words is "fifty-five billion, seven hundred seventy-seven million, five hundred fifty-seven thousand, seven hundred thirty-nine".