51810401816 has 16 divisors (see below), whose sum is σ = 97149146640. Its totient is φ = 25903962720.

The previous prime is 51810401813. The next prime is 51810401827. The reversal of 51810401816 is 61810401815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51810401813) 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, 37046 + ... + 324026.

It is an arithmetic number, because the mean of its divisors is an integer number (6071821665).

Almost surely, 2^51810401816 is an apocalyptic number.

It is an amenable number.

51810401816 is a deficient number, since it is larger than the sum of its proper divisors (45338744824).

51810401816 is a wasteful number, since it uses less digits than its factorization.

51810401816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309554 (or 309550 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 35.

Subtracting 51810401816 from its reverse (61810401815), we obtain a palindrome (9999999999).

The spelling of 51810401816 in words is "fifty-one billion, eight hundred ten million, four hundred one thousand, eight hundred sixteen".