2875587787661 has 2 divisors, whose sum is σ = 2875587787662. Its totient is φ = 2875587787660.

The previous prime is 2875587787573. The next prime is 2875587787663. The reversal of 2875587787661 is 1667877855782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2758140385225 + 117447402436 = 1660765^2 + 342706^2 .

It is a cyclic number.

It is not a de Polignac number, because 2875587787661 - 2²² = 2875583593357 is a prime.

Together with 2875587787663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2875587787663) 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 as a sum of consecutive naturals, namely, 1437793893830 + 1437793893831.

It is an arithmetic number, because the mean of its divisors is an integer number (1437793893831).

Almost surely, 2^{2875587787661} is an apocalyptic number.

It is an amenable number.

2875587787661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2875587787661 is an equidigital number, since it uses as much as digits as its factorization.

2875587787661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2212761600, while the sum is 77.

The spelling of 2875587787661 in words is "two trillion, eight hundred seventy-five billion, five hundred eighty-seven million, seven hundred eighty-seven thousand, six hundred sixty-one".