64581991229 has 12 divisors (see below), whose sum is σ = 75147660000. Its totient is φ = 55340025048.

The previous prime is 64581991207. The next prime is 64581991231. The reversal of 64581991229 is 92219918546.

It is not a de Polignac number, because 64581991229 - 2³² = 60287023933 is a prime.

It is a super-2 number, since 2×64581991229² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64581991289) 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, 16889 + ... + 359790.

It is an arithmetic number, because the mean of its divisors is an integer number (6262305000).

Almost surely, 2^64581991229 is an apocalyptic number.

It is an amenable number.

64581991229 is a deficient number, since it is larger than the sum of its proper divisors (10565668771).

64581991229 is a wasteful number, since it uses less digits than its factorization.

64581991229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380192 (or 380185 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 56.

The spelling of 64581991229 in words is "sixty-four billion, five hundred eighty-one million, nine hundred ninety-one thousand, two hundred twenty-nine".