16397529861 has 4 divisors (see below), whose sum is σ = 21863373152. Its totient is φ = 10931686572.

The previous prime is 16397529823. The next prime is 16397529893. The reversal of 16397529861 is 16892579361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16397529861 - 2¹¹ = 16397527813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16397529821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2732921641 + ... + 2732921646.

It is an arithmetic number, because the mean of its divisors is an integer number (5465843288).

Almost surely, 2^16397529861 is an apocalyptic number.

It is an amenable number.

16397529861 is a deficient number, since it is larger than the sum of its proper divisors (5465843291).

16397529861 is an equidigital number, since it uses as much as digits as its factorization.

16397529861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465843290.

The product of its digits is 4898880, while the sum is 57.

The spelling of 16397529861 in words is "sixteen billion, three hundred ninety-seven million, five hundred twenty-nine thousand, eight hundred sixty-one".