64215412777 has 2 divisors, whose sum is σ = 64215412778. Its totient is φ = 64215412776.

The previous prime is 64215412771. The next prime is 64215412823. The reversal of 64215412777 is 77721451246.

64215412777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (64215412823) can be obtained adding 64215412777 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49293324441 + 14922088336 = 222021^2 + 122156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64215412777 is a prime.

It is not a weakly prime, because it can be changed into another prime (64215412771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32107706388 + 32107706389.

It is an arithmetic number, because the mean of its divisors is an integer number (32107706389).

Almost surely, 2^64215412777 is an apocalyptic number.

It is an amenable number.

64215412777 is a deficient number, since it is larger than the sum of its proper divisors (1).

64215412777 is an equidigital number, since it uses as much as digits as its factorization.

64215412777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 46.

The spelling of 64215412777 in words is "sixty-four billion, two hundred fifteen million, four hundred twelve thousand, seven hundred seventy-seven".