1264016538881 has 2 divisors, whose sum is σ = 1264016538882. Its totient is φ = 1264016538880.

The previous prime is 1264016538871. The next prime is 1264016538943. The reversal of 1264016538881 is 1888356104621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1232508513856 + 31508025025 = 1110184^2 + 177505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264016538881 - 2²² = 1264012344577 is a prime.

It is a super-2 number, since 2×1264016538881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1264016538871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632008269440 + 632008269441.

It is an arithmetic number, because the mean of its divisors is an integer number (632008269441).

Almost surely, 2^{1264016538881} is an apocalyptic number.

It is an amenable number.

1264016538881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264016538881 is an equidigital number, since it uses as much as digits as its factorization.

1264016538881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 1264016538881 in words is "one trillion, two hundred sixty-four billion, sixteen million, five hundred thirty-eight thousand, eight hundred eighty-one".