18968452436 has 6 divisors (see below), whose sum is σ = 33194791770. Its totient is φ = 9484226216.

The previous prime is 18968452427. The next prime is 18968452471. The reversal of 18968452436 is 63425486981.

It can be written as a sum of positive squares in only one way, i.e., 18849642436 + 118810000 = 137294^2 + 10900^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2371056551 + ... + 2371056558.

It is an arithmetic number, because the mean of its divisors is an integer number (5532465295).

Almost surely, 2^18968452436 is an apocalyptic number.

It is an amenable number.

18968452436 is a deficient number, since it is larger than the sum of its proper divisors (14226339334).

18968452436 is a wasteful number, since it uses less digits than its factorization.

18968452436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742113113 (or 4742113111 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 56.

The spelling of 18968452436 in words is "eighteen billion, nine hundred sixty-eight million, four hundred fifty-two thousand, four hundred thirty-six".