921561715699 has 8 divisors (see below), whose sum is σ = 922202910720. Its totient is φ = 920920628616.

The previous prime is 921561715687. The next prime is 921561715729. The reversal of 921561715699 is 996517165129.

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 921561715699 - 2¹¹ = 921561713651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921561715199) 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, 24525444 + ... + 24562990.

It is an arithmetic number, because the mean of its divisors is an integer number (115275363840).

Almost surely, 2^921561715699 is an apocalyptic number.

921561715699 is a deficient number, since it is larger than the sum of its proper divisors (641195021).

921561715699 is a wasteful number, since it uses less digits than its factorization.

921561715699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53969.

The product of its digits is 9185400, while the sum is 61.

The spelling of 921561715699 in words is "nine hundred twenty-one billion, five hundred sixty-one million, seven hundred fifteen thousand, six hundred ninety-nine".