51212102405660 has 48 divisors (see below), whose sum is σ = 123036149558784. Its totient is φ = 17540277427008.

The previous prime is 51212102405657. The next prime is 51212102405669. The reversal of 51212102405660 is 6650420121215.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51212102405660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212102405669) 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, 189006674 + ... + 189277433.

It is an arithmetic number, because the mean of its divisors is an integer number (2563253115808).

Almost surely, 2^{51212102405660} is an apocalyptic number.

It is an amenable number.

51212102405660 is an abundant number, since it is smaller than the sum of its proper divisors (71824047153124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51212102405660 is a wasteful number, since it uses less digits than its factorization.

51212102405660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378285090 (or 378285088 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

Adding to 51212102405660 its reverse (6650420121215), we get a palindrome (57862522526875).

The spelling of 51212102405660 in words is "fifty-one trillion, two hundred twelve billion, one hundred two million, four hundred five thousand, six hundred sixty".