166521060623 has 2 divisors, whose sum is σ = 166521060624. Its totient is φ = 166521060622.

The previous prime is 166521060611. The next prime is 166521060683. The reversal of 166521060623 is 326060125661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166521060623 - 2⁸ = 166521060367 is a prime.

It is a super-2 number, since 2×166521060623² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166521060683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83260530311 + 83260530312.

It is an arithmetic number, because the mean of its divisors is an integer number (83260530312).

Almost surely, 2^166521060623 is an apocalyptic number.

166521060623 is a deficient number, since it is larger than the sum of its proper divisors (1).

166521060623 is an equidigital number, since it uses as much as digits as its factorization.

166521060623 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 38.

The spelling of 166521060623 in words is "one hundred sixty-six billion, five hundred twenty-one million, sixty thousand, six hundred twenty-three".