1694681504381 has 2 divisors, whose sum is σ = 1694681504382. Its totient is φ = 1694681504380.

The previous prime is 1694681504363. The next prime is 1694681504387. The reversal of 1694681504381 is 1834051864961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240528164100 + 454153340281 = 1113790^2 + 673909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1694681504381 - 2³⁰ = 1693607762557 is a prime.

It is a super-2 number, since 2×1694681504381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1694681504387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 847340752190 + 847340752191.

It is an arithmetic number, because the mean of its divisors is an integer number (847340752191).

Almost surely, 2^{1694681504381} is an apocalyptic number.

It is an amenable number.

1694681504381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1694681504381 is an equidigital number, since it uses as much as digits as its factorization.

1694681504381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4976640, while the sum is 56.

The spelling of 1694681504381 in words is "one trillion, six hundred ninety-four billion, six hundred eighty-one million, five hundred four thousand, three hundred eighty-one".