64778111 has 2 divisors, whose sum is σ = 64778112. Its totient is φ = 64778110.

The previous prime is 64778101. The next prime is 64778117. The reversal of 64778111 is 11187746.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64778111 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 (64778117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32389055 + 32389056.

It is an arithmetic number, because the mean of its divisors is an integer number (32389056).

Almost surely, 2^64778111 is an apocalyptic number.

64778111 is a deficient number, since it is larger than the sum of its proper divisors (1).

64778111 is an equidigital number, since it uses as much as digits as its factorization.

64778111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 35.

The square root of 64778111 is about 8048.4850127213. The cubic root of 64778111 is about 401.6145389750.

The spelling of 64778111 in words is "sixty-four million, seven hundred seventy-eight thousand, one hundred eleven".