18947202759539 has 4 divisors (see below), whose sum is σ = 19091837895240. Its totient is φ = 18802567623840.

The previous prime is 18947202759431. The next prime is 18947202759547. The reversal of 18947202759539 is 93595720274981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18947202759539 - 2¹² = 18947202755443 is a prime.

It is a super-2 number, since 2×18947202759539² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18947202719539) 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, 72317567654 + ... + 72317567915.

It is an arithmetic number, because the mean of its divisors is an integer number (4772959473810).

Almost surely, 2^{18947202759539} is an apocalyptic number.

18947202759539 is a deficient number, since it is larger than the sum of its proper divisors (144635135701).

18947202759539 is a wasteful number, since it uses less digits than its factorization.

18947202759539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144635135700.

The product of its (nonzero) digits is 342921600, while the sum is 71.

The spelling of 18947202759539 in words is "eighteen trillion, nine hundred forty-seven billion, two hundred two million, seven hundred fifty-nine thousand, five hundred thirty-nine".