1600561662061 has 2 divisors, whose sum is σ = 1600561662062. Its totient is φ = 1600561662060.

The previous prime is 1600561662059. The next prime is 1600561662097. The reversal of 1600561662061 is 1602661650061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 805450605961 + 795111056100 = 897469^2 + 891690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1600561662061 - 2¹ = 1600561662059 is a prime.

Together with 1600561662059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1600561662001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800280831030 + 800280831031.

It is an arithmetic number, because the mean of its divisors is an integer number (800280831031).

Almost surely, 2^{1600561662061} is an apocalyptic number.

It is an amenable number.

1600561662061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1600561662061 is an equidigital number, since it uses as much as digits as its factorization.

1600561662061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 40.

It can be divided in two parts, 1600561 and 662061, that added together give a palindrome (2262622).

The spelling of 1600561662061 in words is "one trillion, six hundred billion, five hundred sixty-one million, six hundred sixty-two thousand, sixty-one".