1377706397777 has 2 divisors, whose sum is σ = 1377706397778. Its totient is φ = 1377706397776.

The previous prime is 1377706397759. The next prime is 1377706397857. The reversal of 1377706397777 is 7777936077731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 858159524161 + 519546873616 = 926369^2 + 720796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1377706397777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377706397777.

It is not a weakly prime, because it can be changed into another prime (1377706399777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688853198888 + 688853198889.

It is an arithmetic number, because the mean of its divisors is an integer number (688853198889).

Almost surely, 2^{1377706397777} is an apocalyptic number.

It is an amenable number.

1377706397777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377706397777 is an equidigital number, since it uses as much as digits as its factorization.

1377706397777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400241898, while the sum is 71.

The spelling of 1377706397777 in words is "one trillion, three hundred seventy-seven billion, seven hundred six million, three hundred ninety-seven thousand, seven hundred seventy-seven".