64456571 has 4 divisors (see below), whose sum is σ = 68248152. Its totient is φ = 60664992.

The previous prime is 64456543. The next prime is 64456583. The reversal of 64456571 is 17565446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17565446 = 2 ⋅8782723.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64456571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64456501) 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, 1895765 + ... + 1895798.

It is an arithmetic number, because the mean of its divisors is an integer number (17062038).

Almost surely, 2^64456571 is an apocalyptic number.

64456571 is a deficient number, since it is larger than the sum of its proper divisors (3791581).

64456571 is a wasteful number, since it uses less digits than its factorization.

64456571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791580.

The product of its digits is 100800, while the sum is 38.

The square root of 64456571 is about 8028.4849753861. The cubic root of 64456571 is about 400.9489366014.

The spelling of 64456571 in words is "sixty-four million, four hundred fifty-six thousand, five hundred seventy-one".