1377637777657 has 2 divisors, whose sum is σ = 1377637777658. Its totient is φ = 1377637777656.

The previous prime is 1377637777639. The next prime is 1377637777693. The reversal of 1377637777657 is 7567777367731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375434038521 + 2203739136 = 1172789^2 + 46944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377637777657 - 2²³ = 1377629389049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377637777657.

It is not a weakly prime, because it can be changed into another prime (1377637772657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688818888828 + 688818888829.

It is an arithmetic number, because the mean of its divisors is an integer number (688818888829).

Almost surely, 2^{1377637777657} is an apocalyptic number.

It is an amenable number.

1377637777657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377637777657 is an equidigital number, since it uses as much as digits as its factorization.

1377637777657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1334139660, while the sum is 73.

The spelling of 1377637777657 in words is "one trillion, three hundred seventy-seven billion, six hundred thirty-seven million, seven hundred seventy-seven thousand, six hundred fifty-seven".