64506036391 has 16 divisors (see below), whose sum is σ = 65397705120. Its totient is φ = 63620536320.

The previous prime is 64506036341. The next prime is 64506036403. The reversal of 64506036391 is 19363060546.

It is a cyclic number.

It is not a de Polignac number, because 64506036391 - 2⁷ = 64506036263 is a prime.

It is a super-2 number, since 2×64506036391² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64506036341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29279896 + ... + 29282098.

It is an arithmetic number, because the mean of its divisors is an integer number (4087356570).

Almost surely, 2^64506036391 is an apocalyptic number.

64506036391 is a deficient number, since it is larger than the sum of its proper divisors (891668729).

64506036391 is a wasteful number, since it uses less digits than its factorization.

64506036391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426.

The product of its (nonzero) digits is 349920, while the sum is 43.

The spelling of 64506036391 in words is "sixty-four billion, five hundred six million, thirty-six thousand, three hundred ninety-one".