64854661 has 8 divisors (see below), whose sum is σ = 66546648. Its totient is φ = 63205600.

The previous prime is 64854649. The next prime is 64854667. The reversal of 64854661 is 16645846.

64854661 = 5694² + 5695².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32433025 + 32421636 = 5695^2 + 5694^2 .

It is not a de Polignac number, because 64854661 - 2⁷ = 64854533 is a prime.

It is a super-2 number, since 2×64854661² = 8412254106849842, 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 (64854667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68451 + ... + 69391.

It is an arithmetic number, because the mean of its divisors is an integer number (8318331).

Almost surely, 2^64854661 is an apocalyptic number.

64854661 is the 5695-th centered square number.

It is an amenable number.

64854661 is a deficient number, since it is larger than the sum of its proper divisors (1691987).

64854661 is an frugal number, since it uses more digits than its factorization.

64854661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 982 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 64854661 is about 8053.2391619770. The cubic root of 64854661 is about 401.7726761927.

The spelling of 64854661 in words is "sixty-four million, eight hundred fifty-four thousand, six hundred sixty-one".