64121205985 has 8 divisors (see below), whose sum is σ = 80995207680. Its totient is φ = 48597124464.

The previous prime is 64121205917. The next prime is 64121206027. The reversal of 64121205985 is 58950212146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64121205985 is a prime.

It is a super-2 number, since 2×64121205985² (a number of 22 digits) contains 22 as substring.

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, 337479937 + ... + 337480126.

It is an arithmetic number, because the mean of its divisors is an integer number (10124400960).

Almost surely, 2^64121205985 is an apocalyptic number.

It is an amenable number.

64121205985 is a deficient number, since it is larger than the sum of its proper divisors (16874001695).

64121205985 is a wasteful number, since it uses less digits than its factorization.

64121205985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674960087.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 64121205985 in words is "sixty-four billion, one hundred twenty-one million, two hundred five thousand, nine hundred eighty-five".