16195851761 has 4 divisors (see below), whose sum is σ = 16718298624. Its totient is φ = 15673404900.

The previous prime is 16195851757. The next prime is 16195851767. The reversal of 16195851761 is 16715859161.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 16195851761 - 2² = 16195851757 is a prime.

It is a super-2 number, since 2×16195851761² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16195851767) 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, 261223385 + ... + 261223446.

It is an arithmetic number, because the mean of its divisors is an integer number (4179574656).

Almost surely, 2^16195851761 is an apocalyptic number.

It is an amenable number.

16195851761 is a deficient number, since it is larger than the sum of its proper divisors (522446863).

16195851761 is an equidigital number, since it uses as much as digits as its factorization.

16195851761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522446862.

The product of its digits is 453600, while the sum is 50.

The spelling of 16195851761 in words is "sixteen billion, one hundred ninety-five million, eight hundred fifty-one thousand, seven hundred sixty-one".