1667121955 has 4 divisors (see below), whose sum is σ = 2000546352. Its totient is φ = 1333697560.

The previous prime is 1667121947. The next prime is 1667121971. The reversal of 1667121955 is 5591217661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5591217661 = 29 ⋅192800609.

It is not a de Polignac number, because 1667121955 - 2³ = 1667121947 is a prime.

It is a super-2 number, since 2×1667121955² = 5558591225686044050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166712191 + ... + 166712200.

It is an arithmetic number, because the mean of its divisors is an integer number (500136588).

Almost surely, 2^1667121955 is an apocalyptic number.

1667121955 is a deficient number, since it is larger than the sum of its proper divisors (333424397).

1667121955 is an equidigital number, since it uses as much as digits as its factorization.

1667121955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333424396.

The product of its digits is 113400, while the sum is 43.

The square root of 1667121955 is about 40830.4047861395. The cubic root of 1667121955 is about 1185.7390524692.

The spelling of 1667121955 in words is "one billion, six hundred sixty-seven million, one hundred twenty-one thousand, nine hundred fifty-five".