1616465685 has 16 divisors (see below), whose sum is σ = 2586844224. Its totient is φ = 861948672.

The previous prime is 1616465677. The next prime is 1616465759. The reversal of 1616465685 is 5865646161.

It is not a de Polignac number, because 1616465685 - 2³ = 1616465677 is a prime.

It is a super-2 number, since 2×1616465685² = 5225922621565038450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 141549 + ... + 152541.

It is an arithmetic number, because the mean of its divisors is an integer number (161677764).

Almost surely, 2^1616465685 is an apocalyptic number.

1616465685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1616465685 is a deficient number, since it is larger than the sum of its proper divisors (970378539).

1616465685 is a wasteful number, since it uses less digits than its factorization.

1616465685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20804.

The product of its digits is 1036800, while the sum is 48.

The square root of 1616465685 is about 40205.2942409330. The cubic root of 1616465685 is about 1173.6055732270.

It can be divided in two parts, 161646 and 5685, that added together give a triangular number (167331 = T₅₇₈).

The spelling of 1616465685 in words is "one billion, six hundred sixteen million, four hundred sixty-five thousand, six hundred eighty-five".