660550655 has 16 divisors (see below), whose sum is σ = 806488704. Its totient is φ = 519261600.

The previous prime is 660550621. The next prime is 660550673. The reversal of 660550655 is 556055066.

It is a happy number.

It is not a de Polignac number, because 660550655 - 2⁶ = 660550591 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, 146180 + ... + 150630.

It is an arithmetic number, because the mean of its divisors is an integer number (50405544).

Almost surely, 2^660550655 is an apocalyptic number.

660550655 is a deficient number, since it is larger than the sum of its proper divisors (145938049).

660550655 is a wasteful number, since it uses less digits than its factorization.

660550655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 660550655 is about 25701.1800312748. The cubic root of 660550655 is about 870.9008394870.

The spelling of 660550655 in words is "six hundred sixty million, five hundred fifty thousand, six hundred fifty-five".