64550861 has 2 divisors, whose sum is σ = 64550862. Its totient is φ = 64550860.

The previous prime is 64550831. The next prime is 64550879. The reversal of 64550861 is 16805546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 3632836 = 7805^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 64550861 - 2⁶ = 64550797 is a prime.

It is a super-3 number, since 3×64550861³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64550831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32275430 + 32275431.

It is an arithmetic number, because the mean of its divisors is an integer number (32275431).

Almost surely, 2^64550861 is an apocalyptic number.

It is an amenable number.

64550861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64550861 is an equidigital number, since it uses as much as digits as its factorization.

64550861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 64550861 is about 8034.3550456773. The cubic root of 64550861 is about 401.1443501183.

The spelling of 64550861 in words is "sixty-four million, five hundred fifty thousand, eight hundred sixty-one".