660111279 has 4 divisors (see below), whose sum is σ = 880148376. Its totient is φ = 440074184.

The previous prime is 660111259. The next prime is 660111299. The reversal of 660111279 is 972111066.

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

It is an interprime number because it is at equal distance from previous prime (660111259) and next prime (660111299).

It is a cyclic number.

It is not a de Polignac number, because 660111279 - 2⁹ = 660110767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660111209) 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, 110018544 + ... + 110018549.

It is an arithmetic number, because the mean of its divisors is an integer number (220037094).

Almost surely, 2^660111279 is an apocalyptic number.

660111279 is a deficient number, since it is larger than the sum of its proper divisors (220037097).

660111279 is a wasteful number, since it uses less digits than its factorization.

660111279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220037096.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 660111279 is about 25692.6308306487. The cubic root of 660111279 is about 870.7076987096.

The spelling of 660111279 in words is "six hundred sixty million, one hundred eleven thousand, two hundred seventy-nine".