1685961564 has 24 divisors (see below), whose sum is σ = 4495897728. Its totient is φ = 481703280.

The previous prime is 1685961547. The next prime is 1685961569. The reversal of 1685961564 is 4651695861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685961569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10035402 + ... + 10035569.

It is an arithmetic number, because the mean of its divisors is an integer number (187329072).

Almost surely, 2^1685961564 is an apocalyptic number.

1685961564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1685961564 is an abundant number, since it is smaller than the sum of its proper divisors (2809936164).

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

1685961564 is a wasteful number, since it uses less digits than its factorization.

1685961564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20070985 (or 20070983 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The square root of 1685961564 is about 41060.4622964720. The cubic root of 1685961564 is about 1190.1888841714.

The spelling of 1685961564 in words is "one billion, six hundred eighty-five million, nine hundred sixty-one thousand, five hundred sixty-four".