64445551 has 2 divisors, whose sum is σ = 64445552. Its totient is φ = 64445550.

The previous prime is 64445531. The next prime is 64445603. The reversal of 64445551 is 15554446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64445551 - 2¹¹ = 64443503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64445531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222775 + 32222776.

It is an arithmetic number, because the mean of its divisors is an integer number (32222776).

Almost surely, 2^64445551 is an apocalyptic number.

64445551 is a deficient number, since it is larger than the sum of its proper divisors (1).

64445551 is an equidigital number, since it uses as much as digits as its factorization.

64445551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48000, while the sum is 34.

The square root of 64445551 is about 8027.7986397268. The cubic root of 64445551 is about 400.9260855094.

Adding to 64445551 its reverse (15554446), we get a palindrome (79999997).

The spelling of 64445551 in words is "sixty-four million, four hundred forty-five thousand, five hundred fifty-one".