1601742887401 has 2 divisors, whose sum is σ = 1601742887402. Its totient is φ = 1601742887400.

The previous prime is 1601742887377. The next prime is 1601742887453. The reversal of 1601742887401 is 1047882471061.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 825370433001 + 776372454400 = 908499^2 + 881120^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601742887401 - 2⁷ = 1601742887273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601742887471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800871443700 + 800871443701.

It is an arithmetic number, because the mean of its divisors is an integer number (800871443701).

Almost surely, 2^{1601742887401} is an apocalyptic number.

It is an amenable number.

1601742887401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601742887401 is an equidigital number, since it uses as much as digits as its factorization.

1601742887401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 1601742887401 in words is "one trillion, six hundred one billion, seven hundred forty-two million, eight hundred eighty-seven thousand, four hundred one".