64881760220641 has 128 divisors (see below), whose sum is σ = 82773105085440. Its totient is φ = 49493425766400.

The previous prime is 64881760220609. The next prime is 64881760220647. The reversal of 64881760220641 is 14602206718846.

It is not a de Polignac number, because 64881760220641 - 2⁵ = 64881760220609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64881760220647) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 140741345151 + ... + 140741345611.

It is an arithmetic number, because the mean of its divisors is an integer number (646664883480).

Almost surely, 2^{64881760220641} is an apocalyptic number.

It is an amenable number.

64881760220641 is a deficient number, since it is larger than the sum of its proper divisors (17891344864799).

64881760220641 is a wasteful number, since it uses less digits than its factorization.

64881760220641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595.

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 64881760220641 in words is "sixty-four trillion, eight hundred eighty-one billion, seven hundred sixty million, two hundred twenty thousand, six hundred forty-one".