6601540115861 has 2 divisors, whose sum is σ = 6601540115862. Its totient is φ = 6601540115860.

The previous prime is 6601540115803. The next prime is 6601540116007. The reversal of 6601540115861 is 1685110451066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3913694629636 + 2687845486225 = 1978306^2 + 1639465^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601540115861 - 2³⁴ = 6584360246677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601540115461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300770057930 + 3300770057931.

It is an arithmetic number, because the mean of its divisors is an integer number (3300770057931).

Almost surely, 2^{6601540115861} is an apocalyptic number.

It is an amenable number.

6601540115861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601540115861 is an equidigital number, since it uses as much as digits as its factorization.

6601540115861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 6601540115861 in words is "six trillion, six hundred one billion, five hundred forty million, one hundred fifteen thousand, eight hundred sixty-one".