15964743661 has 8 divisors (see below), whose sum is σ = 16609501184. Its totient is φ = 15328096560.

The previous prime is 15964743637. The next prime is 15964743679. The reversal of 15964743661 is 16634746951.

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 15964743661 - 2¹⁹ = 15964219373 is a prime.

It is a super-2 number, since 2×15964743661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15964743599 and 15964743608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15964743611) 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, 2023590 + ... + 2031463.

It is an arithmetic number, because the mean of its divisors is an integer number (2076187648).

Almost surely, 2^15964743661 is an apocalyptic number.

It is an amenable number.

15964743661 is a deficient number, since it is larger than the sum of its proper divisors (644757523).

15964743661 is a wasteful number, since it uses less digits than its factorization.

15964743661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055211.

The product of its digits is 3265920, while the sum is 52.

The spelling of 15964743661 in words is "fifteen billion, nine hundred sixty-four million, seven hundred forty-three thousand, six hundred sixty-one".