1691357664 has 48 divisors (see below), whose sum is σ = 4444578432. Its totient is φ = 563180928.

The previous prime is 1691357663. The next prime is 1691357753. The reversal of 1691357664 is 4667531961.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691357663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85407 + ... + 103329.

It is an arithmetic number, because the mean of its divisors is an integer number (92595384).

Almost surely, 2^1691357664 is an apocalyptic number.

It is an amenable number.

1691357664 is an abundant number, since it is smaller than the sum of its proper divisors (2753220768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1691357664 is a wasteful number, since it uses less digits than its factorization.

1691357664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18919 (or 18911 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The square root of 1691357664 is about 41126.1189999737. The cubic root of 1691357664 is about 1191.4573074255.

The spelling of 1691357664 in words is "one billion, six hundred ninety-one million, three hundred fifty-seven thousand, six hundred sixty-four".