1694068561 has 4 divisors (see below), whose sum is σ = 1697397300. Its totient is φ = 1690739824.

The previous prime is 1694068559. The next prime is 1694068577. The reversal of 1694068561 is 1658604961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1580539536 + 113529025 = 39756^2 + 10655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1694068561 - 2¹ = 1694068559 is a prime.

It is a super-2 number, since 2×1694068561² = 5739736578737221442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1694068511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1663606 + ... + 1664623.

It is an arithmetic number, because the mean of its divisors is an integer number (424349325).

Almost surely, 2^1694068561 is an apocalyptic number.

It is an amenable number.

1694068561 is a deficient number, since it is larger than the sum of its proper divisors (3328739).

1694068561 is an equidigital number, since it uses as much as digits as its factorization.

1694068561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328738.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1694068561 is about 41159.0641414501. The cubic root of 1694068561 is about 1192.0935209663.

The spelling of 1694068561 in words is "one billion, six hundred ninety-four million, sixty-eight thousand, five hundred sixty-one".