770631661 has 2 divisors, whose sum is σ = 770631662. Its totient is φ = 770631660.

The previous prime is 770631647. The next prime is 770631731. The reversal of 770631661 is 166136077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601475625 + 169156036 = 24525^2 + 13006^2 .

It is an emirp because it is prime and its reverse (166136077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 770631661 - 2²¹ = 768534509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 770631661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (770631601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385315830 + 385315831.

It is an arithmetic number, because the mean of its divisors is an integer number (385315831).

Almost surely, 2^770631661 is an apocalyptic number.

It is an amenable number.

770631661 is a deficient number, since it is larger than the sum of its proper divisors (1).

770631661 is an equidigital number, since it uses as much as digits as its factorization.

770631661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 770631661 is about 27760.2532589312. The cubic root of 770631661 is about 916.8162084331.

The spelling of 770631661 in words is "seven hundred seventy million, six hundred thirty-one thousand, six hundred sixty-one".