166530409387919 has 2 divisors, whose sum is σ = 166530409387920. Its totient is φ = 166530409387918.

The previous prime is 166530409387873. The next prime is 166530409387957. The reversal of 166530409387919 is 919783904035661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166530409387919 - 2²⁰ = 166530408339343 is a prime.

It is a super-2 number, since 2×166530409387919² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166530409387819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265204693959 + 83265204693960.

It is an arithmetic number, because the mean of its divisors is an integer number (83265204693960).

Almost surely, 2^{166530409387919} is an apocalyptic number.

166530409387919 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530409387919 is an equidigital number, since it uses as much as digits as its factorization.

166530409387919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264539520, while the sum is 71.

The spelling of 166530409387919 in words is "one hundred sixty-six trillion, five hundred thirty billion, four hundred nine million, three hundred eighty-seven thousand, nine hundred nineteen".