166583838761 has 2 divisors, whose sum is σ = 166583838762. Its totient is φ = 166583838760.

The previous prime is 166583838749. The next prime is 166583838779. The reversal of 166583838761 is 167838385661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166154064400 + 429774361 = 407620^2 + 20731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166583838761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166583838694 and 166583838703.

It is not a weakly prime, because it can be changed into another prime (166583838061) 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, 83291919380 + 83291919381.

It is an arithmetic number, because the mean of its divisors is an integer number (83291919381).

Almost surely, 2^166583838761 is an apocalyptic number.

It is an amenable number.

166583838761 is a deficient number, since it is larger than the sum of its proper divisors (1).

166583838761 is an equidigital number, since it uses as much as digits as its factorization.

166583838761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 62.

The spelling of 166583838761 in words is "one hundred sixty-six billion, five hundred eighty-three million, eight hundred thirty-eight thousand, seven hundred sixty-one".