76661281 has 2 divisors, whose sum is σ = 76661282. Its totient is φ = 76661280.

The previous prime is 76661251. The next prime is 76661339. The reversal of 76661281 is 18216667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70829056 + 5832225 = 8416^2 + 2415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76661281 is a prime.

It is a super-3 number, since 3×76661281³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 76661281.

It is not a weakly prime, because it can be changed into another prime (76661251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38330640 + 38330641.

It is an arithmetic number, because the mean of its divisors is an integer number (38330641).

Almost surely, 2^76661281 is an apocalyptic number.

It is an amenable number.

76661281 is a deficient number, since it is larger than the sum of its proper divisors (1).

76661281 is an equidigital number, since it uses as much as digits as its factorization.

76661281 is an odious number, because the sum of its binary digits is odd.

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

The square root of 76661281 is about 8755.6428090689. The cubic root of 76661281 is about 424.8073516726.

The spelling of 76661281 in words is "seventy-six million, six hundred sixty-one thousand, two hundred eighty-one".