18952247521 has 2 divisors, whose sum is σ = 18952247522. Its totient is φ = 18952247520.

The previous prime is 18952247507. The next prime is 18952247527. The reversal of 18952247521 is 12574225981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11933159121 + 7019088400 = 109239^2 + 83780^2 .

It is a cyclic number.

It is not a de Polignac number, because 18952247521 - 2⁷ = 18952247393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18952247527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9476123760 + 9476123761.

It is an arithmetic number, because the mean of its divisors is an integer number (9476123761).

Almost surely, 2^18952247521 is an apocalyptic number.

It is an amenable number.

18952247521 is a deficient number, since it is larger than the sum of its proper divisors (1).

18952247521 is an equidigital number, since it uses as much as digits as its factorization.

18952247521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 403200, while the sum is 46.

The spelling of 18952247521 in words is "eighteen billion, nine hundred fifty-two million, two hundred forty-seven thousand, five hundred twenty-one".