247666924885 has 4 divisors (see below), whose sum is σ = 297200309868. Its totient is φ = 198133539904.

The previous prime is 247666924849. The next prime is 247666924913. The reversal of 247666924885 is 588429666742.

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

It can be written as a sum of positive squares in 2 ways, for example, as 90167477841 + 157499447044 = 300279^2 + 396862^2 .

It is a cyclic number.

It is not a de Polignac number, because 247666924885 - 2²³ = 247658536277 is a prime.

It is a super-2 number, since 2×247666924885² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247666924885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24766692484 + ... + 24766692493.

It is an arithmetic number, because the mean of its divisors is an integer number (74300077467).

Almost surely, 2^247666924885 is an apocalyptic number.

It is an amenable number.

247666924885 is a deficient number, since it is larger than the sum of its proper divisors (49533384983).

247666924885 is an equidigital number, since it uses as much as digits as its factorization.

247666924885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49533384982.

The product of its digits is 278691840, while the sum is 67.

The spelling of 247666924885 in words is "two hundred forty-seven billion, six hundred sixty-six million, nine hundred twenty-four thousand, eight hundred eighty-five".