64126657099 has 4 divisors (see below), whose sum is σ = 64484906760. Its totient is φ = 63768407440.

The previous prime is 64126657057. The next prime is 64126657159. The reversal of 64126657099 is 99075662146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64126657099 - 2²⁹ = 63589786187 is a prime.

It is a super-3 number, since 3×64126657099³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64126657039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179124562 + ... + 179124919.

It is an arithmetic number, because the mean of its divisors is an integer number (16121226690).

Almost surely, 2^64126657099 is an apocalyptic number.

64126657099 is a deficient number, since it is larger than the sum of its proper divisors (358249661).

64126657099 is a wasteful number, since it uses less digits than its factorization.

64126657099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358249660.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 64126657099 in words is "sixty-four billion, one hundred twenty-six million, six hundred fifty-seven thousand, ninety-nine".