655768779 has 8 divisors (see below), whose sum is σ = 880649280. Its totient is φ = 434033736.

The previous prime is 655768739. The next prime is 655768787. The reversal of 655768779 is 977867556.

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

It is not a de Polignac number, because 655768779 - 2¹⁷ = 655637707 is a prime.

It is a super-2 number, since 2×655768779² = 860065383022301682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (655768739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785877 + ... + 786710.

It is an arithmetic number, because the mean of its divisors is an integer number (110081160).

Almost surely, 2^655768779 is an apocalyptic number.

655768779 is a deficient number, since it is larger than the sum of its proper divisors (224880501).

655768779 is a wasteful number, since it uses less digits than its factorization.

655768779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572729.

The product of its digits is 22226400, while the sum is 60.

The square root of 655768779 is about 25607.9827202378. The cubic root of 655768779 is about 868.7941982310.

The spelling of 655768779 in words is "six hundred fifty-five million, seven hundred sixty-eight thousand, seven hundred seventy-nine".