64040551 has 4 divisors (see below), whose sum is σ = 64122712. Its totient is φ = 63958392.

The previous prime is 64040531. The next prime is 64040569. The reversal of 64040551 is 15504046.

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

It is a cyclic number.

It is not a de Polignac number, because 64040551 - 2¹⁹ = 63516263 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 (64040521) 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, 39900 + ... + 41473.

It is an arithmetic number, because the mean of its divisors is an integer number (16030678).

Almost surely, 2^64040551 is an apocalyptic number.

64040551 is a deficient number, since it is larger than the sum of its proper divisors (82161).

64040551 is an equidigital number, since it uses as much as digits as its factorization.

64040551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82160.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 64040551 is about 8002.5340361663. The cubic root of 64040551 is about 400.0844634136.

Adding to 64040551 its reverse (15504046), we get a palindrome (79544597).

The spelling of 64040551 in words is "sixty-four million, forty thousand, five hundred fifty-one".