166622616553 has 4 divisors (see below), whose sum is σ = 170497561168. Its totient is φ = 162747671940.

The previous prime is 166622616551. The next prime is 166622616599. The reversal of 166622616553 is 355616226661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355616226661 = 167 ⋅2129438483.

It is not a de Polignac number, because 166622616553 - 2¹ = 166622616551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166622616497 and 166622616506.

It is not an unprimeable number, because it can be changed into a prime (166622616551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937472243 + ... + 1937472328.

It is an arithmetic number, because the mean of its divisors is an integer number (42624390292).

Almost surely, 2^166622616553 is an apocalyptic number.

It is an amenable number.

166622616553 is a deficient number, since it is larger than the sum of its proper divisors (3874944615).

166622616553 is an equidigital number, since it uses as much as digits as its factorization.

166622616553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874944614.

The product of its digits is 2332800, while the sum is 49.

The spelling of 166622616553 in words is "one hundred sixty-six billion, six hundred twenty-two million, six hundred sixteen thousand, five hundred fifty-three".