1575421370881 has 2 divisors, whose sum is σ = 1575421370882. Its totient is φ = 1575421370880.

The previous prime is 1575421370867. The next prime is 1575421370893. The reversal of 1575421370881 is 1880731245751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1279930195600 + 295491175281 = 1131340^2 + 543591^2 .

It is a cyclic number.

It is not a de Polignac number, because 1575421370881 - 2⁵ = 1575421370849 is a prime.

It is a super-2 number, since 2×1575421370881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1575421370681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 787710685440 + 787710685441.

It is an arithmetic number, because the mean of its divisors is an integer number (787710685441).

Almost surely, 2^{1575421370881} is an apocalyptic number.

It is an amenable number.

1575421370881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1575421370881 is an equidigital number, since it uses as much as digits as its factorization.

1575421370881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 1575421370881 in words is "one trillion, five hundred seventy-five billion, four hundred twenty-one million, three hundred seventy thousand, eight hundred eighty-one".