661110087 has 16 divisors (see below), whose sum is σ = 964484352. Its totient is φ = 399477120.

The previous prime is 661110031. The next prime is 661110143. The reversal of 661110087 is 780011166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (661110031) and next prime (661110143).

It is not a de Polignac number, because 661110087 - 2⁸ = 661109831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661110017) 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 15 ways as a sum of consecutive naturals, for example, 18603 + ... + 40844.

It is an arithmetic number, because the mean of its divisors is an integer number (60280272).

Almost surely, 2^661110087 is an apocalyptic number.

661110087 is a deficient number, since it is larger than the sum of its proper divisors (303374265).

661110087 is a wasteful number, since it uses less digits than its factorization.

661110087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59798.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 661110087 is about 25712.0611192491. The cubic root of 661110087 is about 871.1466305389.

The spelling of 661110087 in words is "six hundred sixty-one million, one hundred ten thousand, eighty-seven".