1685961563 has 8 divisors (see below), whose sum is σ = 1980710256. Its totient is φ = 1414792800.

The previous prime is 1685961547. The next prime is 1685961569. The reversal of 1685961563 is 3651695861.

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

It is a cyclic number.

It is not a de Polignac number, because 1685961563 - 2⁴ = 1685961547 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5894828 + ... + 5895113.

It is an arithmetic number, because the mean of its divisors is an integer number (247588782).

Almost surely, 2^1685961563 is an apocalyptic number.

1685961563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1685961563 is a deficient number, since it is larger than the sum of its proper divisors (294748693).

1685961563 is a wasteful number, since it uses less digits than its factorization.

1685961563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11789965.

The product of its digits is 1166400, while the sum is 50.

The square root of 1685961563 is about 41060.4622842949. The cubic root of 1685961563 is about 1190.1888839361.

The spelling of 1685961563 in words is "one billion, six hundred eighty-five million, nine hundred sixty-one thousand, five hundred sixty-three".