64061663 has 4 divisors (see below), whose sum is σ = 64115520. Its totient is φ = 64007808.

The previous prime is 64061629. The next prime is 64061707. The reversal of 64061663 is 36616046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64061663 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 (64061363) 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, 25103 + ... + 27536.

It is an arithmetic number, because the mean of its divisors is an integer number (16028880).

Almost surely, 2^64061663 is an apocalyptic number.

64061663 is a deficient number, since it is larger than the sum of its proper divisors (53857).

64061663 is a wasteful number, since it uses less digits than its factorization.

64061663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53856.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 64061663 is about 8003.8530096448. The cubic root of 64061663 is about 400.1284233475.

The spelling of 64061663 in words is "sixty-four million, sixty-one thousand, six hundred sixty-three".