87777116657 has 4 divisors (see below), whose sum is σ = 88118662116. Its totient is φ = 87435571200.

The previous prime is 87777116653. The next prime is 87777116677. The reversal of 87777116657 is 75661177778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75661177778 = 2 ⋅37830588889.

It can be written as a sum of positive squares in 2 ways, for example, as 85278016576 + 2499100081 = 292024^2 + 49991^2 .

It is a cyclic number.

It is not a de Polignac number, because 87777116657 - 2² = 87777116653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87777116657.

It is not an unprimeable number, because it can be changed into a prime (87777116653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170772344 + ... + 170772857.

It is an arithmetic number, because the mean of its divisors is an integer number (22029665529).

Almost surely, 2^87777116657 is an apocalyptic number.

It is an amenable number.

87777116657 is a deficient number, since it is larger than the sum of its proper divisors (341545459).

87777116657 is a wasteful number, since it uses less digits than its factorization.

87777116657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341545458.

The product of its digits is 24202080, while the sum is 62.

The spelling of 87777116657 in words is "eighty-seven billion, seven hundred seventy-seven million, one hundred sixteen thousand, six hundred fifty-seven".