64580428397 has 18 divisors (see below), whose sum is σ = 66924111114. Its totient is φ = 62296428480.

The previous prime is 64580428373. The next prime is 64580428421. The reversal of 64580428397 is 79382408546.

It is an interprime number because it is at equal distance from previous prime (64580428373) and next prime (64580428421).

It can be written as a sum of positive squares in 3 ways, for example, as 5168315881 + 59412112516 = 71891^2 + 243746^2 .

It is not a de Polignac number, because 64580428397 - 2⁸ = 64580428141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64580428337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 123954497 + ... + 123955017.

It is an arithmetic number, because the mean of its divisors is an integer number (3718006173).

Almost surely, 2^64580428397 is an apocalyptic number.

64580428397 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

64580428397 is a deficient number, since it is larger than the sum of its proper divisors (2343682717).

64580428397 is an frugal number, since it uses more digits than its factorization.

64580428397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 64580428397 in words is "sixty-four billion, five hundred eighty million, four hundred twenty-eight thousand, three hundred ninety-seven".