64805501 has 4 divisors (see below), whose sum is σ = 64847292. Its totient is φ = 64763712.

The previous prime is 64805471. The next prime is 64805509. The reversal of 64805501 is 10550846.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52562500 + 12243001 = 7250^2 + 3499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64805501 is a prime.

It is a super-2 number, since 2×64805501² = 8399505919722002, which 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 (64805509) 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, 18476 + ... + 21701.

It is an arithmetic number, because the mean of its divisors is an integer number (16211823).

Almost surely, 2^64805501 is an apocalyptic number.

It is an amenable number.

64805501 is a deficient number, since it is larger than the sum of its proper divisors (41791).

64805501 is a wasteful number, since it uses less digits than its factorization.

64805501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41790.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 64805501 is about 8050.1863953576. The cubic root of 64805501 is about 401.6711356248.

The spelling of 64805501 in words is "sixty-four million, eight hundred five thousand, five hundred one".