51378394497 has 16 divisors (see below), whose sum is σ = 71493166080. Its totient is φ = 32758367312.

The previous prime is 51378394433. The next prime is 51378394499. The reversal of 51378394497 is 79449387315.

It is a cyclic number.

It is not a de Polignac number, because 51378394497 - 2⁶ = 51378394433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51378394497.

It is not an unprimeable number, because it can be changed into a prime (51378394499) 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 15 ways as a sum of consecutive naturals, for example, 472318 + ... + 570824.

It is an arithmetic number, because the mean of its divisors is an integer number (4468322880).

Almost surely, 2^51378394497 is an apocalyptic number.

It is an amenable number.

51378394497 is a deficient number, since it is larger than the sum of its proper divisors (20114771583).

51378394497 is a wasteful number, since it uses less digits than its factorization.

51378394497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106092.

The product of its digits is 22861440, while the sum is 60.

The spelling of 51378394497 in words is "fifty-one billion, three hundred seventy-eight million, three hundred ninety-four thousand, four hundred ninety-seven".