64681011 has 12 divisors (see below), whose sum is σ = 96888792. Its totient is φ = 43120512.

The previous prime is 64681007. The next prime is 64681021. The reversal of 64681011 is 11018646.

64681011 is a `hidden beast` number, since 646 + 8 + 1 + 0 + 11 = 666.

It is not a de Polignac number, because 64681011 - 2² = 64681007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (64681021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132846 + ... + 133331.

It is an arithmetic number, because the mean of its divisors is an integer number (8074066).

Almost surely, 2^64681011 is an apocalyptic number.

64681011 is a deficient number, since it is larger than the sum of its proper divisors (32207781).

64681011 is an equidigital number, since it uses as much as digits as its factorization.

64681011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266192 (or 266180 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 64681011 is about 8042.4505593755. The cubic root of 64681011 is about 401.4137701645.

Adding to 64681011 its reverse (11018646), we get a palindrome (75699657).

The spelling of 64681011 in words is "sixty-four million, six hundred eighty-one thousand, eleven".