87756748661 has 4 divisors (see below), whose sum is σ = 87757948524. Its totient is φ = 87755548800.

The previous prime is 87756748657. The next prime is 87756748669. The reversal of 87756748661 is 16684765778.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59685421636 + 28071327025 = 244306^2 + 167545^2 .

It is a cyclic number.

It is not a de Polignac number, because 87756748661 - 2² = 87756748657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87756748669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482570 + ... + 639051.

It is an arithmetic number, because the mean of its divisors is an integer number (21939487131).

Almost surely, 2^87756748661 is an apocalyptic number.

It is an amenable number.

87756748661 is a deficient number, since it is larger than the sum of its proper divisors (1199863).

87756748661 is a wasteful number, since it uses less digits than its factorization.

87756748661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1199862.

The product of its digits is 94832640, while the sum is 65.

The spelling of 87756748661 in words is "eighty-seven billion, seven hundred fifty-six million, seven hundred forty-eight thousand, six hundred sixty-one".