64121899449 has 32 divisors (see below), whose sum is σ = 88830443520. Its totient is φ = 41093946432.

The previous prime is 64121899417. The next prime is 64121899469. The reversal of 64121899449 is 94499812146.

It is a happy number.

It is not a de Polignac number, because 64121899449 - 2⁵ = 64121899417 is a prime.

It is a super-2 number, since 2×64121899449² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64121899469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24223044 + ... + 24225690.

It is an arithmetic number, because the mean of its divisors is an integer number (2775951360).

Almost surely, 2^64121899449 is an apocalyptic number.

It is an amenable number.

64121899449 is a deficient number, since it is larger than the sum of its proper divisors (24708544071).

64121899449 is a wasteful number, since it uses less digits than its factorization.

64121899449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3789.

The product of its digits is 4478976, while the sum is 57.

The spelling of 64121899449 in words is "sixty-four billion, one hundred twenty-one million, eight hundred ninety-nine thousand, four hundred forty-nine".