55998749777 has 2 divisors, whose sum is σ = 55998749778. Its totient is φ = 55998749776.

The previous prime is 55998749693. The next prime is 55998749783. The reversal of 55998749777 is 77794789955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42544837696 + 13453912081 = 206264^2 + 115991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55998749777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55998749698 and 55998749707.

It is not a weakly prime, because it can be changed into another prime (55998749797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27999374888 + 27999374889.

It is an arithmetic number, because the mean of its divisors is an integer number (27999374889).

Almost surely, 2^55998749777 is an apocalyptic number.

It is an amenable number.

55998749777 is a deficient number, since it is larger than the sum of its proper divisors (1).

55998749777 is an equidigital number, since it uses as much as digits as its factorization.

55998749777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1400263200, while the sum is 77.

The spelling of 55998749777 in words is "fifty-five billion, nine hundred ninety-eight million, seven hundred forty-nine thousand, seven hundred seventy-seven".