661302002655 has 80 divisors (see below), whose sum is σ = 1413698609664. Its totient is φ = 289165567680.

The previous prime is 661302002653. The next prime is 661302002687. The reversal of 661302002655 is 556200203166.

It is a happy number.

661302002655 is a `hidden beast` number, since 66 + 130 + 200 + 265 + 5 = 666.

It is not a de Polignac number, because 661302002655 - 2¹ = 661302002653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661302002653) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5005741 + ... + 5136150.

Almost surely, 2^661302002655 is an apocalyptic number.

661302002655 is an abundant number, since it is smaller than the sum of its proper divisors (752396607009).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661302002655 is a wasteful number, since it uses less digits than its factorization.

661302002655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10141938 (or 10141929 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 661302002655 in words is "six hundred sixty-one billion, three hundred two million, two thousand, six hundred fifty-five".