661107655 has 8 divisors (see below), whose sum is σ = 854354592. Its totient is φ = 488202528.

The previous prime is 661107619. The next prime is 661107659. The reversal of 661107655 is 556701166.

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 661107655 - 2¹³ = 661099463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661107659) 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, 5085379 + ... + 5085508.

It is an arithmetic number, because the mean of its divisors is an integer number (106794324).

Almost surely, 2^661107655 is an apocalyptic number.

661107655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661107655 is a deficient number, since it is larger than the sum of its proper divisors (193246937).

661107655 is a wasteful number, since it uses less digits than its factorization.

661107655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10170905.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 661107655 is about 25712.0138262253. The cubic root of 661107655 is about 871.1455623198.

The spelling of 661107655 in words is "six hundred sixty-one million, one hundred seven thousand, six hundred fifty-five".