1601318077081 has 2 divisors, whose sum is σ = 1601318077082. Its totient is φ = 1601318077080.

The previous prime is 1601318077057. The next prime is 1601318077171. The reversal of 1601318077081 is 1807708131061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830074055056 + 771244022025 = 911084^2 + 878205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601318077081 - 2²¹ = 1601315979929 is a prime.

It is a super-2 number, since 2×1601318077081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1601318077981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800659038540 + 800659038541.

It is an arithmetic number, because the mean of its divisors is an integer number (800659038541).

Almost surely, 2^{1601318077081} is an apocalyptic number.

It is an amenable number.

1601318077081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601318077081 is an equidigital number, since it uses as much as digits as its factorization.

1601318077081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 43.

The spelling of 1601318077081 in words is "one trillion, six hundred one billion, three hundred eighteen million, seventy-seven thousand, eighty-one".