23721680497 has 4 divisors (see below), whose sum is σ = 23863726656. Its totient is φ = 23579634340.

The previous prime is 23721680491. The next prime is 23721680501. The reversal of 23721680497 is 79408612732.

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 23721680497 - 2¹⁹ = 23721156209 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23721680497.

It is not an unprimeable number, because it can be changed into a prime (23721680491) 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, 71022829 + ... + 71023162.

It is an arithmetic number, because the mean of its divisors is an integer number (5965931664).

Almost surely, 2^23721680497 is an apocalyptic number.

It is an amenable number.

23721680497 is a deficient number, since it is larger than the sum of its proper divisors (142046159).

23721680497 is a wasteful number, since it uses less digits than its factorization.

23721680497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142046158.

The product of its (nonzero) digits is 1016064, while the sum is 49.

It can be divided in two parts, 237216 and 80497, that added together give a palindrome (317713).

The spelling of 23721680497 in words is "twenty-three billion, seven hundred twenty-one million, six hundred eighty thousand, four hundred ninety-seven".