18436489501 has 2 divisors, whose sum is σ = 18436489502. Its totient is φ = 18436489500.

The previous prime is 18436489459. The next prime is 18436489517. The reversal of 18436489501 is 10598463481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15081068025 + 3355421476 = 122805^2 + 57926^2 .

It is a cyclic number.

It is not a de Polignac number, because 18436489501 - 2¹⁵ = 18436456733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18436489301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9218244750 + 9218244751.

It is an arithmetic number, because the mean of its divisors is an integer number (9218244751).

Almost surely, 2^18436489501 is an apocalyptic number.

It is an amenable number.

18436489501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18436489501 is an equidigital number, since it uses as much as digits as its factorization.

18436489501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 18436489501 in words is "eighteen billion, four hundred thirty-six million, four hundred eighty-nine thousand, five hundred one".