16465491685 has 4 divisors (see below), whose sum is σ = 19758590028. Its totient is φ = 13172393344.

The previous prime is 16465491667. The next prime is 16465491697. The reversal of 16465491685 is 58619456461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58619456461 = 1609 ⋅36432229.

It can be written as a sum of positive squares in 2 ways, for example, as 5536252836 + 10929238849 = 74406^2 + 104543^2 .

It is a cyclic number.

It is not a de Polignac number, because 16465491685 - 2¹³ = 16465483493 is a prime.

It is a super-2 number, since 2×16465491685² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1646549164 + ... + 1646549173.

It is an arithmetic number, because the mean of its divisors is an integer number (4939647507).

Almost surely, 2^16465491685 is an apocalyptic number.

It is an amenable number.

16465491685 is a deficient number, since it is larger than the sum of its proper divisors (3293098343).

16465491685 is an equidigital number, since it uses as much as digits as its factorization.

16465491685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3293098342.

The product of its digits is 6220800, while the sum is 55.

The spelling of 16465491685 in words is "sixteen billion, four hundred sixty-five million, four hundred ninety-one thousand, six hundred eighty-five".