166015553579 has 2 divisors, whose sum is σ = 166015553580. Its totient is φ = 166015553578.

The previous prime is 166015553551. The next prime is 166015553597. The reversal of 166015553579 is 975355510661.

It is a happy number.

Together with next prime (166015553597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166015553579 is a prime.

It is a super-2 number, since 2×166015553579² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166015553579.

It is not a weakly prime, because it can be changed into another prime (166015553479) 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, 83007776789 + 83007776790.

It is an arithmetic number, because the mean of its divisors is an integer number (83007776790).

Almost surely, 2^166015553579 is an apocalyptic number.

166015553579 is a deficient number, since it is larger than the sum of its proper divisors (1).

166015553579 is an equidigital number, since it uses as much as digits as its factorization.

166015553579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4252500, while the sum is 53.

The spelling of 166015553579 in words is "one hundred sixty-six billion, fifteen million, five hundred fifty-three thousand, five hundred seventy-nine".