670665655 has 16 divisors (see below), whose sum is σ = 879022368. Its totient is φ = 487168000.

The previous prime is 670665649. The next prime is 670665661. The reversal of 670665655 is 556566076.

It is an interprime number because it is at equal distance from previous prime (670665649) and next prime (670665661).

It is not a de Polignac number, because 670665655 - 2¹⁷ = 670534583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41535 + ... + 55375.

It is an arithmetic number, because the mean of its divisors is an integer number (54938898).

Almost surely, 2^670665655 is an apocalyptic number.

670665655 is a deficient number, since it is larger than the sum of its proper divisors (208356713).

670665655 is a wasteful number, since it uses less digits than its factorization.

670665655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14738.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The square root of 670665655 is about 25897.2132670679. The cubic root of 670665655 is about 875.3237028177.

It can be divided in two parts, 6706 and 65655, that added together give a square (72361 = 269²).

The spelling of 670665655 in words is "six hundred seventy million, six hundred sixty-five thousand, six hundred fifty-five".