64103472581 has 4 divisors (see below), whose sum is σ = 65006338464. Its totient is φ = 63200606700.

The previous prime is 64103472497. The next prime is 64103472613. The reversal of 64103472581 is 18527430146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18527430146 = 2 ⋅9263715073.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64103472581 is a prime.

It is a super-2 number, since 2×64103472581² (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 (64103472781) 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 3 ways as a sum of consecutive naturals, for example, 451432835 + ... + 451432976.

It is an arithmetic number, because the mean of its divisors is an integer number (16251584616).

Almost surely, 2^64103472581 is an apocalyptic number.

It is an amenable number.

64103472581 is a deficient number, since it is larger than the sum of its proper divisors (902865883).

64103472581 is an equidigital number, since it uses as much as digits as its factorization.

64103472581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902865882.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 64103472581 in words is "sixty-four billion, one hundred three million, four hundred seventy-two thousand, five hundred eighty-one".