1667298979 has 4 divisors (see below), whose sum is σ = 1667427840. Its totient is φ = 1667170120.

The previous prime is 1667298929. The next prime is 1667299019. The reversal of 1667298979 is 9798927661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1667298979 - 2¹⁹ = 1666774691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1667298979.

It is not an unprimeable number, because it can be changed into a prime (1667298929) 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, 42544 + ... + 71725.

It is an arithmetic number, because the mean of its divisors is an integer number (416856960).

Almost surely, 2^1667298979 is an apocalyptic number.

1667298979 is a deficient number, since it is larger than the sum of its proper divisors (128861).

1667298979 is a wasteful number, since it uses less digits than its factorization.

1667298979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128860.

The product of its digits is 20575296, while the sum is 64.

The square root of 1667298979 is about 40832.5725248851. The cubic root of 1667298979 is about 1185.7810203728.

The spelling of 1667298979 in words is "one billion, six hundred sixty-seven million, two hundred ninety-eight thousand, nine hundred seventy-nine".