18984747629 has 4 divisors (see below), whose sum is σ = 18986126076. Its totient is φ = 18983369184.

The previous prime is 18984747571. The next prime is 18984747643. The reversal of 18984747629 is 92674748981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92674748981 = 953 ⋅97245277.

It can be written as a sum of positive squares in 2 ways, for example, as 9623217604 + 9361530025 = 98098^2 + 96755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18984747629 is a prime.

It is a super-2 number, since 2×18984747629² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18984747689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668354 + ... + 696179.

It is an arithmetic number, because the mean of its divisors is an integer number (4746531519).

Almost surely, 2^18984747629 is an apocalyptic number.

It is an amenable number.

18984747629 is a deficient number, since it is larger than the sum of its proper divisors (1378447).

18984747629 is a wasteful number, since it uses less digits than its factorization.

18984747629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378446.

The product of its digits is 48771072, while the sum is 65.

The spelling of 18984747629 in words is "eighteen billion, nine hundred eighty-four million, seven hundred forty-seven thousand, six hundred twenty-nine".