247994639897 has 4 divisors (see below), whose sum is σ = 252673784100. Its totient is φ = 243315495696.

The previous prime is 247994639891. The next prime is 247994639923. The reversal of 247994639897 is 798936499742.

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 188339508361 + 59655131536 = 433981^2 + 244244^2 .

It is a cyclic number.

It is not a de Polignac number, because 247994639897 - 2⁶ = 247994639833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247994639891) 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, 2339572022 + ... + 2339572127.

It is an arithmetic number, because the mean of its divisors is an integer number (63168446025).

Almost surely, 2^247994639897 is an apocalyptic number.

It is an amenable number.

247994639897 is a deficient number, since it is larger than the sum of its proper divisors (4679144203).

247994639897 is an equidigital number, since it uses as much as digits as its factorization.

247994639897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679144202.

The product of its digits is 1481421312, while the sum is 77.

The spelling of 247994639897 in words is "two hundred forty-seven billion, nine hundred ninety-four million, six hundred thirty-nine thousand, eight hundred ninety-seven".