18963667645 has 16 divisors (see below), whose sum is σ = 24509766960. Its totient is φ = 14002297344.

The previous prime is 18963667643. The next prime is 18963667691. The reversal of 18963667645 is 54676636981.

It can be written as a sum of positive squares in 8 ways, for example, as 48066489 + 18915601156 = 6933^2 + 137534^2 .

It is a cyclic number.

It is not a de Polignac number, because 18963667645 - 2¹ = 18963667643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18963667643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1045897 + ... + 1063873.

It is an arithmetic number, because the mean of its divisors is an integer number (1531860435).

Almost surely, 2^18963667645 is an apocalyptic number.

It is an amenable number.

18963667645 is a deficient number, since it is larger than the sum of its proper divisors (5546099315).

18963667645 is a wasteful number, since it uses less digits than its factorization.

18963667645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34224.

The product of its digits is 39191040, while the sum is 61.

The spelling of 18963667645 in words is "eighteen billion, nine hundred sixty-three million, six hundred sixty-seven thousand, six hundred forty-five".