667779155 has 8 divisors (see below), whose sum is σ = 803250000. Its totient is φ = 532946656.

The previous prime is 667779127. The next prime is 667779163. The reversal of 667779155 is 551977766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667779155 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667779097 and 667779106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157280 + ... + 161469.

It is an arithmetic number, because the mean of its divisors is an integer number (100406250).

Almost surely, 2^667779155 is an apocalyptic number.

667779155 is a deficient number, since it is larger than the sum of its proper divisors (135470845).

667779155 is a wasteful number, since it uses less digits than its factorization.

667779155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319173.

The product of its digits is 2778300, while the sum is 53.

The square root of 667779155 is about 25841.4232386686. The cubic root of 667779155 is about 874.0661187318.

The spelling of 667779155 in words is "six hundred sixty-seven million, seven hundred seventy-nine thousand, one hundred fifty-five".