660061655 has 48 divisors (see below), whose sum is σ = 900910080. Its totient is φ = 463657920.

The previous prime is 660061643. The next prime is 660061667. The reversal of 660061655 is 556160066.

It is an interprime number because it is at equal distance from previous prime (660061643) and next prime (660061667).

It is not a de Polignac number, because 660061655 - 2⁸ = 660061399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3952382 + ... + 3952548.

It is an arithmetic number, because the mean of its divisors is an integer number (18768960).

Almost surely, 2^660061655 is an apocalyptic number.

660061655 is a deficient number, since it is larger than the sum of its proper divisors (240848425).

660061655 is a wasteful number, since it uses less digits than its factorization.

660061655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 660061655 is about 25691.6650881176. The cubic root of 660061655 is about 870.6858796199.

The spelling of 660061655 in words is "six hundred sixty million, sixty-one thousand, six hundred fifty-five".