1395908651681 has 2 divisors, whose sum is σ = 1395908651682. Its totient is φ = 1395908651680.

The previous prime is 1395908651663. The next prime is 1395908651759. The reversal of 1395908651681 is 1861568095931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1024125784081 + 371782867600 = 1011991^2 + 609740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1395908651681 - 2³⁰ = 1394834909857 is a prime.

It is a super-2 number, since 2×1395908651681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1395908651651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 697954325840 + 697954325841.

It is an arithmetic number, because the mean of its divisors is an integer number (697954325841).

Almost surely, 2^{1395908651681} is an apocalyptic number.

It is an amenable number.

1395908651681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1395908651681 is an equidigital number, since it uses as much as digits as its factorization.

1395908651681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13996800, while the sum is 62.

The spelling of 1395908651681 in words is "one trillion, three hundred ninety-five billion, nine hundred eight million, six hundred fifty-one thousand, six hundred eighty-one".