76616621 has 2 divisors, whose sum is σ = 76616622. Its totient is φ = 76616620.

The previous prime is 76616609. The next prime is 76616623. The reversal of 76616621 is 12661667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 35271721 = 6430^2 + 5939^2 .

It is an emirp because it is prime and its reverse (12661667) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76616621 is a prime.

It is a super-2 number, since 2×76616621² = 11740213226915282, which contains 22 as substring.

Together with 76616623, 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 (76616623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38308310 + 38308311.

It is an arithmetic number, because the mean of its divisors is an integer number (38308311).

Almost surely, 2^76616621 is an apocalyptic number.

It is an amenable number.

76616621 is a deficient number, since it is larger than the sum of its proper divisors (1).

76616621 is an equidigital number, since it uses as much as digits as its factorization.

76616621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 76616621 is about 8753.0920822301. The cubic root of 76616621 is about 424.7248433478.

The spelling of 76616621 in words is "seventy-six million, six hundred sixteen thousand, six hundred twenty-one".