23719786985 has 4 divisors (see below), whose sum is σ = 28463744388. Its totient is φ = 18975829584.

The previous prime is 23719786973. The next prime is 23719786991. The reversal of 23719786985 is 58968791732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6088993024 + 17630793961 = 78032^2 + 132781^2 .

It is a cyclic number.

It is not a de Polignac number, because 23719786985 - 2⁴ = 23719786969 is a prime.

It is a super-2 number, since 2×23719786985² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2371978694 + ... + 2371978703.

It is an arithmetic number, because the mean of its divisors is an integer number (7115936097).

Almost surely, 2^23719786985 is an apocalyptic number.

It is an amenable number.

23719786985 is a deficient number, since it is larger than the sum of its proper divisors (4743957403).

23719786985 is an equidigital number, since it uses as much as digits as its factorization.

23719786985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743957402.

The product of its digits is 45722880, while the sum is 65.

The spelling of 23719786985 in words is "twenty-three billion, seven hundred nineteen million, seven hundred eighty-six thousand, nine hundred eighty-five".