77233661 has 2 divisors, whose sum is σ = 77233662. Its totient is φ = 77233660.

The previous prime is 77233657. The next prime is 77233721. The reversal of 77233661 is 16633277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 17480761 = 7730^2 + 4181^2 .

It is an emirp because it is prime and its reverse (16633277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77233661 - 2² = 77233657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77233621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38616830 + 38616831.

It is an arithmetic number, because the mean of its divisors is an integer number (38616831).

Almost surely, 2^77233661 is an apocalyptic number.

It is an amenable number.

77233661 is a deficient number, since it is larger than the sum of its proper divisors (1).

77233661 is an equidigital number, since it uses as much as digits as its factorization.

77233661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 35.

The square root of 77233661 is about 8788.2683732349. The cubic root of 77233661 is about 425.8619847970.

The spelling of 77233661 in words is "seventy-seven million, two hundred thirty-three thousand, six hundred sixty-one".