1853578468081 has 2 divisors, whose sum is σ = 1853578468082. Its totient is φ = 1853578468080.

The previous prime is 1853578468073. The next prime is 1853578468087. The reversal of 1853578468081 is 1808648753581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1389805210000 + 463773258081 = 1178900^2 + 681009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1853578468081 - 2³ = 1853578468073 is a prime.

It is a super-2 number, since 2×1853578468081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1853578468087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 926789234040 + 926789234041.

It is an arithmetic number, because the mean of its divisors is an integer number (926789234041).

Almost surely, 2^{1853578468081} is an apocalyptic number.

It is an amenable number.

1853578468081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1853578468081 is an equidigital number, since it uses as much as digits as its factorization.

1853578468081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51609600, while the sum is 64.

The spelling of 1853578468081 in words is "one trillion, eight hundred fifty-three billion, five hundred seventy-eight million, four hundred sixty-eight thousand, eighty-one".