64511601 has 32 divisors (see below), whose sum is σ = 107870208. Its totient is φ = 33315840.

The previous prime is 64511581. The next prime is 64511611. The reversal of 64511601 is 10611546.

It is not a de Polignac number, because 64511601 - 2⁹ = 64511089 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64511611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43860 + ... + 45306.

It is an arithmetic number, because the mean of its divisors is an integer number (3370944).

Almost surely, 2^64511601 is an apocalyptic number.

It is an amenable number.

64511601 is a deficient number, since it is larger than the sum of its proper divisors (43358607).

64511601 is a wasteful number, since it uses less digits than its factorization.

64511601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 64511601 is about 8031.9114163442. The cubic root of 64511601 is about 401.0630079494.

It can be divided in two parts, 645 and 11601, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 64511601 in words is "sixty-four million, five hundred eleven thousand, six hundred one".