166154064409 has 2 divisors, whose sum is σ = 166154064410. Its totient is φ = 166154064408.

The previous prime is 166154064367. The next prime is 166154064487. The reversal of 166154064409 is 904460451661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166154064400 + 9 = 407620^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 166154064409 - 2³⁷ = 28715110937 is a prime.

It is not a weakly prime, because it can be changed into another prime (166154064499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83077032204 + 83077032205.

It is an arithmetic number, because the mean of its divisors is an integer number (83077032205).

Almost surely, 2^166154064409 is an apocalyptic number.

It is an amenable number.

166154064409 is a deficient number, since it is larger than the sum of its proper divisors (1).

166154064409 is an equidigital number, since it uses as much as digits as its factorization.

166154064409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 166154064409 in words is "one hundred sixty-six billion, one hundred fifty-four million, sixty-four thousand, four hundred nine".