51185591963 has 4 divisors (see below), whose sum is σ = 55838827608. Its totient is φ = 46532356320.

The previous prime is 51185591927. The next prime is 51185592037. The reversal of 51185591963 is 36919558115.

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

It is a cyclic number.

It is not a de Polignac number, because 51185591963 - 2¹⁴ = 51185575579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51185591923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2326617806 + ... + 2326617827.

It is an arithmetic number, because the mean of its divisors is an integer number (13959706902).

Almost surely, 2^51185591963 is an apocalyptic number.

51185591963 is a deficient number, since it is larger than the sum of its proper divisors (4653235645).

51185591963 is a wasteful number, since it uses less digits than its factorization.

51185591963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4653235644.

The product of its digits is 1458000, while the sum is 53.

The spelling of 51185591963 in words is "fifty-one billion, one hundred eighty-five million, five hundred ninety-one thousand, nine hundred sixty-three".