23487515549 has 4 divisors (see below), whose sum is σ = 23488920540. Its totient is φ = 23486110560.

The previous prime is 23487515543. The next prime is 23487515573. The reversal of 23487515549 is 94551578432.

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 17231812900 + 6255702649 = 131270^2 + 79093^2 .

It is a cyclic number.

It is not a de Polignac number, because 23487515549 - 2⁴ = 23487515533 is a prime.

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 23487515549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23487515543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677114 + ... + 710955.

It is an arithmetic number, because the mean of its divisors is an integer number (5872230135).

Almost surely, 2^23487515549 is an apocalyptic number.

It is an amenable number.

23487515549 is a deficient number, since it is larger than the sum of its proper divisors (1404991).

23487515549 is a wasteful number, since it uses less digits than its factorization.

23487515549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404990.

The product of its digits is 6048000, while the sum is 53.

The spelling of 23487515549 in words is "twenty-three billion, four hundred eighty-seven million, five hundred fifteen thousand, five hundred forty-nine".