64642825161 has 12 divisors (see below), whose sum is σ = 93595822320. Its totient is φ = 42992361720.

The previous prime is 64642825157. The next prime is 64642825199. The reversal of 64642825161 is 16152824646.

It is a happy number.

64642825161 is a `hidden beast` number, since 6 + 46 + 428 + 25 + 161 = 666.

64642825161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64642825161 - 2² = 64642825157 is a prime.

It is a super-2 number, since 2×64642825161² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64642825151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8567275 + ... + 8574816.

It is an arithmetic number, because the mean of its divisors is an integer number (7799651860).

Almost surely, 2^64642825161 is an apocalyptic number.

It is an amenable number.

64642825161 is a deficient number, since it is larger than the sum of its proper divisors (28952997159).

64642825161 is a wasteful number, since it uses less digits than its factorization.

64642825161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17142516 (or 17142513 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The spelling of 64642825161 in words is "sixty-four billion, six hundred forty-two million, eight hundred twenty-five thousand, one hundred sixty-one".