65121604213365 has 72 divisors (see below), whose sum is σ = 138217282500960. Its totient is φ = 28203040603584.

The previous prime is 65121604213307. The next prime is 65121604213373. The reversal of 65121604213365 is 56331240612156.

It is a happy number.

65121604213365 is a `hidden beast` number, since 6 + 5 + 1 + 2 + 1 + 604 + 2 + 1 + 3 + 36 + 5 = 666.

It is not a de Polignac number, because 65121604213365 - 2²³ = 65121595824757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 65121604213365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 777158299 + ... + 777242088.

It is an arithmetic number, because the mean of its divisors is an integer number (1919684479180).

Almost surely, 2^{65121604213365} is an apocalyptic number.

It is an amenable number.

65121604213365 is an abundant number, since it is smaller than the sum of its proper divisors (73095678287595).

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

65121604213365 is a wasteful number, since it uses less digits than its factorization.

65121604213365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554400431 (or 1554400421 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 65121604213365 in words is "sixty-five trillion, one hundred twenty-one billion, six hundred four million, two hundred thirteen thousand, three hundred sixty-five".