51999999947 has 16 divisors (see below), whose sum is σ = 59868668160. Its totient is φ = 44242258848.

The previous prime is 51999999937. The next prime is 51999999971. The reversal of 51999999947 is 74999999915.

51999999947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51999999947 - 2¹⁰ = 51999998923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51999999937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660668 + ... + 735174.

It is an arithmetic number, because the mean of its divisors is an integer number (3741791760).

Almost surely, 2^51999999947 is an apocalyptic number.

51999999947 is a deficient number, since it is larger than the sum of its proper divisors (7868668213).

51999999947 is a wasteful number, since it uses less digits than its factorization.

51999999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75250.

The product of its digits is 669615660, while the sum is 80.

The spelling of 51999999947 in words is "fifty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-seven".