4887685661 has 2 divisors, whose sum is σ = 4887685662. Its totient is φ = 4887685660.

The previous prime is 4887685651. The next prime is 4887685667. The reversal of 4887685661 is 1665867884.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4332140761 + 555544900 = 65819^2 + 23570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4887685661 is a prime.

It is a super-2 number, since 2×4887685661² = 47778942241490013842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 4887685661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4887685667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2443842830 + 2443842831.

It is an arithmetic number, because the mean of its divisors is an integer number (2443842831).

Almost surely, 2^4887685661 is an apocalyptic number.

It is an amenable number.

4887685661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4887685661 is an equidigital number, since it uses as much as digits as its factorization.

4887685661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15482880, while the sum is 59.

The square root of 4887685661 is about 69911.9851026990. The cubic root of 4887685661 is about 1697.0752085993.

The spelling of 4887685661 in words is "four billion, eight hundred eighty-seven million, six hundred eighty-five thousand, six hundred sixty-one".