47145939898 has 4 divisors (see below), whose sum is σ = 70718909850. Its totient is φ = 23572969948.

The previous prime is 47145939859. The next prime is 47145939913. The reversal of 47145939898 is 89893954174.

It is a happy number.

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., 41645789329 + 5500150569 = 204073^2 + 74163^2 .

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11786484973 + ... + 11786484976.

Almost surely, 2^47145939898 is an apocalyptic number.

47145939898 is a deficient number, since it is larger than the sum of its proper divisors (23572969952).

47145939898 is a wasteful number, since it uses less digits than its factorization.

47145939898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23572969951.

The product of its digits is 78382080, while the sum is 67.

The spelling of 47145939898 in words is "forty-seven billion, one hundred forty-five million, nine hundred thirty-nine thousand, eight hundred ninety-eight".