64765121405 has 8 divisors (see below), whose sum is σ = 77729560632. Its totient is φ = 51804487168.

The previous prime is 64765121341. The next prime is 64765121411. The reversal of 64765121405 is 50412156746.

It can be written as a sum of positive squares in 4 ways, for example, as 1883039236 + 62882082169 = 43394^2 + 250763^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64765121405 - 2⁶ = 64765121341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 913664 + ... + 981993.

It is an arithmetic number, because the mean of its divisors is an integer number (9716195079).

Almost surely, 2^64765121405 is an apocalyptic number.

It is an amenable number.

64765121405 is a deficient number, since it is larger than the sum of its proper divisors (12964439227).

64765121405 is a wasteful number, since it uses less digits than its factorization.

64765121405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1902495.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 64765121405 in words is "sixty-four billion, seven hundred sixty-five million, one hundred twenty-one thousand, four hundred five".