7801602661 has 2 divisors, whose sum is σ = 7801602662. Its totient is φ = 7801602660.

The previous prime is 7801602647. The next prime is 7801602769. The reversal of 7801602661 is 1662061087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7755444225 + 46158436 = 88065^2 + 6794^2 .

It is an emirp because it is prime and its reverse (1662061087) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7801602661 is a prime.

It is a super-3 number, since 3×7801602661³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7801602661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7801602161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900801330 + 3900801331.

It is an arithmetic number, because the mean of its divisors is an integer number (3900801331).

Almost surely, 2^7801602661 is an apocalyptic number.

It is an amenable number.

7801602661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7801602661 is an equidigital number, since it uses as much as digits as its factorization.

7801602661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 7801602661 is about 88326.6814784751. The cubic root of 7801602661 is about 1983.3283018084.

The spelling of 7801602661 in words is "seven billion, eight hundred one million, six hundred two thousand, six hundred sixty-one".