64121534225 has 24 divisors (see below), whose sum is σ = 91718647488. Its totient is φ = 43558113600.

The previous prime is 64121534209. The next prime is 64121534231. The reversal of 64121534225 is 52243512146.

It is not a de Polignac number, because 64121534225 - 2⁴ = 64121534209 is a prime.

It is a super-2 number, since 2×64121534225² (a number of 22 digits) contains 22 as substring.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1693466 + ... + 1730915.

It is an arithmetic number, because the mean of its divisors is an integer number (3821610312).

Almost surely, 2^64121534225 is an apocalyptic number.

It is an amenable number.

64121534225 is a deficient number, since it is larger than the sum of its proper divisors (27597113263).

64121534225 is a wasteful number, since it uses less digits than its factorization.

64121534225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3424505 (or 3424500 counting only the distinct ones).

The product of its digits is 57600, while the sum is 35.

The spelling of 64121534225 in words is "sixty-four billion, one hundred twenty-one million, five hundred thirty-four thousand, two hundred twenty-five".