47978974251 has 48 divisors (see below), whose sum is σ = 79184196000. Its totient is φ = 27732464640.

The previous prime is 47978974247. The next prime is 47978974261. The reversal of 47978974251 is 15247987974.

47978974251 is a `hidden beast` number, since 47 + 97 + 89 + 7 + 425 + 1 = 666.

It is not a de Polignac number, because 47978974251 - 2² = 47978974247 is a prime.

It is a super-2 number, since 2×47978974251² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (47978974261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 968341 + ... + 1016681.

It is an arithmetic number, because the mean of its divisors is an integer number (1649670750).

Almost surely, 2^47978974251 is an apocalyptic number.

47978974251 is a deficient number, since it is larger than the sum of its proper divisors (31205221749).

47978974251 is a wasteful number, since it uses less digits than its factorization.

47978974251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48876 (or 48873 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 63.

The spelling of 47978974251 in words is "forty-seven billion, nine hundred seventy-eight million, nine hundred seventy-four thousand, two hundred fifty-one".