64581483881 has 2 divisors, whose sum is σ = 64581483882. Its totient is φ = 64581483880.

The previous prime is 64581483877. The next prime is 64581483893. The reversal of 64581483881 is 18838418546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64406318656 + 175165225 = 253784^2 + 13235^2 .

It is a cyclic number.

It is not a de Polignac number, because 64581483881 - 2² = 64581483877 is a prime.

It is a super-2 number, since 2×64581483881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64581483871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32290741940 + 32290741941.

It is an arithmetic number, because the mean of its divisors is an integer number (32290741941).

Almost surely, 2^64581483881 is an apocalyptic number.

It is an amenable number.

64581483881 is a deficient number, since it is larger than the sum of its proper divisors (1).

64581483881 is an equidigital number, since it uses as much as digits as its factorization.

64581483881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5898240, while the sum is 56.

The spelling of 64581483881 in words is "sixty-four billion, five hundred eighty-one million, four hundred eighty-three thousand, eight hundred eighty-one".