51221606605602 has 16 divisors (see below), whose sum is σ = 102503509413600. Its totient is φ = 17063819501472.

The previous prime is 51221606605601. The next prime is 51221606605669. The reversal of 51221606605602 is 20650660612215.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51221606605601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512330723 + ... + 2512351110.

It is an arithmetic number, because the mean of its divisors is an integer number (6406469338350).

Almost surely, 2^{51221606605602} is an apocalyptic number.

51221606605602 is an abundant number, since it is smaller than the sum of its proper divisors (51281902807998).

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

51221606605602 is a wasteful number, since it uses less digits than its factorization.

51221606605602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024683537.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 51221606605602 in words is "fifty-one trillion, two hundred twenty-one billion, six hundred six million, six hundred five thousand, six hundred two".