64677366221 has 12 divisors (see below), whose sum is σ = 70062099732. Its totient is φ = 59679300096.

The previous prime is 64677366209. The next prime is 64677366239. The reversal of 64677366221 is 12266377646.

64677366221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 22204278121 + 42473088100 = 149011^2 + 206090^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64677366221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64677366221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64677366251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 377015 + ... + 521051.

It is an arithmetic number, because the mean of its divisors is an integer number (5838508311).

Almost surely, 2^64677366221 is an apocalyptic number.

It is an amenable number.

64677366221 is a deficient number, since it is larger than the sum of its proper divisors (5384733511).

64677366221 is a wasteful number, since it uses less digits than its factorization.

64677366221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146720 (or 146707 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 50.

The spelling of 64677366221 in words is "sixty-four billion, six hundred seventy-seven million, three hundred sixty-six thousand, two hundred twenty-one".