64890676081 has 16 divisors (see below), whose sum is σ = 85661642880. Its totient is φ = 47589799680.

The previous prime is 64890676021. The next prime is 64890676091. The reversal of 64890676081 is 18067609846.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64890676081 - 2²¹ = 64888578929 is a prime.

It is a super-2 number, since 2×64890676081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64890676021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24785046 + ... + 24787663.

It is an arithmetic number, because the mean of its divisors is an integer number (5353852680).

Almost surely, 2^64890676081 is an apocalyptic number.

It is an amenable number.

64890676081 is a deficient number, since it is larger than the sum of its proper divisors (20770966799).

64890676081 is a wasteful number, since it uses less digits than its factorization.

64890676081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49572744.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 64890676081 in words is "sixty-four billion, eight hundred ninety million, six hundred seventy-six thousand, eighty-one".