50978847591 has 12 divisors (see below), whose sum is σ = 84155558032. Its totient is φ = 29130770016.

The previous prime is 50978847583. The next prime is 50978847629. The reversal of 50978847591 is 19574887905.

50978847591 is a `hidden beast` number, since 5 + 0 + 9 + 78 + 8 + 475 + 91 = 666.

It is not a de Polignac number, because 50978847591 - 2³ = 50978847583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 809188057 = 50978847591 / (5 + 0 + 9 + 7 + 8 + 8 + 4 + 7 + 5 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50978847691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404593966 + ... + 404594091.

Almost surely, 2^50978847591 is an apocalyptic number.

50978847591 is a deficient number, since it is larger than the sum of its proper divisors (33176710441).

50978847591 is a wasteful number, since it uses less digits than its factorization.

50978847591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809188070 (or 809188067 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 63.

The spelling of 50978847591 in words is "fifty billion, nine hundred seventy-eight million, eight hundred forty-seven thousand, five hundred ninety-one".