1689405537634 has 8 divisors (see below), whose sum is σ = 2552605447788. Its totient is φ = 838537055040.

The previous prime is 1689405537629. The next prime is 1689405537641. The reversal of 1689405537634 is 4367355049861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1640712495409 + 48693042225 = 1280903^2 + 220665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082856547 + ... + 3082857094.

Almost surely, 2^{1689405537634} is an apocalyptic number.

1689405537634 is a deficient number, since it is larger than the sum of its proper divisors (863199910154).

1689405537634 is a wasteful number, since it uses less digits than its factorization.

1689405537634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165713780.

The product of its (nonzero) digits is 65318400, while the sum is 61.

The spelling of 1689405537634 in words is "one trillion, six hundred eighty-nine billion, four hundred five million, five hundred thirty-seven thousand, six hundred thirty-four".