2788113661 has 2 divisors, whose sum is σ = 2788113662. Its totient is φ = 2788113660.

The previous prime is 2788113607. The next prime is 2788113721. The reversal of 2788113661 is 1663118872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2725466436 + 62647225 = 52206^2 + 7915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2788113661 - 2¹³ = 2788105469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2788113961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1394056830 + 1394056831.

It is an arithmetic number, because the mean of its divisors is an integer number (1394056831).

Almost surely, 2^2788113661 is an apocalyptic number.

It is an amenable number.

2788113661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2788113661 is an equidigital number, since it uses as much as digits as its factorization.

2788113661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 2788113661 is about 52802.5914231489. The cubic root of 2788113661 is about 1407.4624750987.

The spelling of 2788113661 in words is "two billion, seven hundred eighty-eight million, one hundred thirteen thousand, six hundred sixty-one".