215723705793 has 4 divisors (see below), whose sum is σ = 287631607728. Its totient is φ = 143815803860.

The previous prime is 215723705779. The next prime is 215723705797. The reversal of 215723705793 is 397507327512.

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 215723705793 - 2¹³ = 215723697601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215723705797) 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, 35953950963 + ... + 35953950968.

It is an arithmetic number, because the mean of its divisors is an integer number (71907901932).

Almost surely, 2^215723705793 is an apocalyptic number.

It is an amenable number.

215723705793 is a deficient number, since it is larger than the sum of its proper divisors (71907901935).

215723705793 is an equidigital number, since it uses as much as digits as its factorization.

215723705793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71907901934.

The product of its (nonzero) digits is 2778300, while the sum is 51.

The spelling of 215723705793 in words is "two hundred fifteen billion, seven hundred twenty-three million, seven hundred five thousand, seven hundred ninety-three".