1691135537690 has 32 divisors (see below), whose sum is σ = 3087047448576. Its totient is φ = 666898686720.

The previous prime is 1691135537687. The next prime is 1691135537701. The reversal of 1691135537690 is 967355311961.

It is a super-2 number, since 2×1691135537690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27732674 + ... + 27793586.

It is an arithmetic number, because the mean of its divisors is an integer number (96470232768).

Almost surely, 2^{1691135537690} is an apocalyptic number.

1691135537690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1691135537690 is a deficient number, since it is larger than the sum of its proper divisors (1395911910886).

1691135537690 is a wasteful number, since it uses less digits than its factorization.

1691135537690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100094.

The product of its (nonzero) digits is 4592700, while the sum is 56.

The spelling of 1691135537690 in words is "one trillion, six hundred ninety-one billion, one hundred thirty-five million, five hundred thirty-seven thousand, six hundred ninety".