661614655 has 8 divisors (see below), whose sum is σ = 855009792. Its totient is φ = 488576928.

The previous prime is 661614643. The next prime is 661614659. The reversal of 661614655 is 556416166.

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

It is a cyclic number.

It is not a de Polignac number, because 661614655 - 2²³ = 653226047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661614659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5089279 + ... + 5089408.

It is an arithmetic number, because the mean of its divisors is an integer number (106876224).

Almost surely, 2^661614655 is an apocalyptic number.

661614655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661614655 is a deficient number, since it is larger than the sum of its proper divisors (193395137).

661614655 is a wasteful number, since it uses less digits than its factorization.

661614655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10178705.

The product of its digits is 129600, while the sum is 40.

The square root of 661614655 is about 25721.8711411126. The cubic root of 661614655 is about 871.3681977408.

The spelling of 661614655 in words is "six hundred sixty-one million, six hundred fourteen thousand, six hundred fifty-five".