247795447138 has 4 divisors (see below), whose sum is σ = 371693170710. Its totient is φ = 123897723568.

The previous prime is 247795447129. The next prime is 247795447157. The reversal of 247795447138 is 831744597742.

It is a happy number.

247795447138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 209349257209 + 38446189929 = 457547^2 + 196077^2 .

It is a super-2 number, since 2×247795447138² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61948861783 + ... + 61948861786.

Almost surely, 2^247795447138 is an apocalyptic number.

247795447138 is a deficient number, since it is larger than the sum of its proper divisors (123897723572).

247795447138 is a wasteful number, since it uses less digits than its factorization.

247795447138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123897723571.

The product of its digits is 47416320, while the sum is 61.

The spelling of 247795447138 in words is "two hundred forty-seven billion, seven hundred ninety-five million, four hundred forty-seven thousand, one hundred thirty-eight".