2151780830777 has 2 divisors, whose sum is σ = 2151780830778. Its totient is φ = 2151780830776.

The previous prime is 2151780830743. The next prime is 2151780830803. The reversal of 2151780830777 is 7770380871512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1947534682681 + 204246148096 = 1395541^2 + 451936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151780830777 - 2⁶ = 2151780830713 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151780830707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075890415388 + 1075890415389.

It is an arithmetic number, because the mean of its divisors is an integer number (1075890415389).

Almost surely, 2^{2151780830777} is an apocalyptic number.

It is an amenable number.

2151780830777 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151780830777 is an equidigital number, since it uses as much as digits as its factorization.

2151780830777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4609920, while the sum is 56.

The spelling of 2151780830777 in words is "two trillion, one hundred fifty-one billion, seven hundred eighty million, eight hundred thirty thousand, seven hundred seventy-seven".