64444157 has 2 divisors, whose sum is σ = 64444158. Its totient is φ = 64444156.

The previous prime is 64444147. The next prime is 64444187. The reversal of 64444157 is 75144446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64224196 + 219961 = 8014^2 + 469^2 .

It is a cyclic number.

It is not a de Polignac number, because 64444157 - 2⁴ = 64444141 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64444147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222078 + 32222079.

It is an arithmetic number, because the mean of its divisors is an integer number (32222079).

Almost surely, 2^64444157 is an apocalyptic number.

It is an amenable number.

64444157 is a deficient number, since it is larger than the sum of its proper divisors (1).

64444157 is an equidigital number, since it uses as much as digits as its factorization.

64444157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 35.

The square root of 64444157 is about 8027.7118159535. The cubic root of 64444157 is about 400.9231947229.

It can be divided in two parts, 6444 and 4157, that added together give a palindrome (10601).

The spelling of 64444157 in words is "sixty-four million, four hundred forty-four thousand, one hundred fifty-seven".