64855501 has 2 divisors, whose sum is σ = 64855502. Its totient is φ = 64855500.

The previous prime is 64855499. The next prime is 64855523. The reversal of 64855501 is 10555846.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 32194276 = 5715^2 + 5674^2 .

It is a cyclic number.

It is not a de Polignac number, because 64855501 - 2¹ = 64855499 is a prime.

It is a super-2 number, since 2×64855501² = 8412472019922002, which contains 22 as substring.

Together with 64855499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64855541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32427750 + 32427751.

It is an arithmetic number, because the mean of its divisors is an integer number (32427751).

Almost surely, 2^64855501 is an apocalyptic number.

It is an amenable number.

64855501 is a deficient number, since it is larger than the sum of its proper divisors (1).

64855501 is an equidigital number, since it uses as much as digits as its factorization.

64855501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 64855501 is about 8053.2913147359. The cubic root of 64855501 is about 401.7744107768.

It can be divided in two parts, 64855 and 501, that added together give a palindrome (65356).

The spelling of 64855501 in words is "sixty-four million, eight hundred fifty-five thousand, five hundred one".