23687242721573 has 2 divisors, whose sum is σ = 23687242721574. Its totient is φ = 23687242721572.

The previous prime is 23687242721543. The next prime is 23687242721587. The reversal of 23687242721573 is 37512724278632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14139841048804 + 9547401672769 = 3760298^2 + 3089887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23687242721573 is a prime.

It is a super-2 number, since 2×23687242721573² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23687242721543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11843621360786 + 11843621360787.

It is an arithmetic number, because the mean of its divisors is an integer number (11843621360787).

Almost surely, 2^{23687242721573} is an apocalyptic number.

It is an amenable number.

23687242721573 is a deficient number, since it is larger than the sum of its proper divisors (1).

23687242721573 is an equidigital number, since it uses as much as digits as its factorization.

23687242721573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 59.

The spelling of 23687242721573 in words is "twenty-three trillion, six hundred eighty-seven billion, two hundred forty-two million, seven hundred twenty-one thousand, five hundred seventy-three".