766252510981 has 2 divisors, whose sum is σ = 766252510982. Its totient is φ = 766252510980.

The previous prime is 766252510973. The next prime is 766252511029. The reversal of 766252510981 is 189015252667.

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., 746107250625 + 20145260356 = 863775^2 + 141934^2 .

It is a cyclic number.

It is not a de Polignac number, because 766252510981 - 2³ = 766252510973 is a prime.

It is a super-2 number, since 2×766252510981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766252510901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383126255490 + 383126255491.

It is an arithmetic number, because the mean of its divisors is an integer number (383126255491).

Almost surely, 2^766252510981 is an apocalyptic number.

It is an amenable number.

766252510981 is a deficient number, since it is larger than the sum of its proper divisors (1).

766252510981 is an equidigital number, since it uses as much as digits as its factorization.

766252510981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 766252510981 in words is "seven hundred sixty-six billion, two hundred fifty-two million, five hundred ten thousand, nine hundred eighty-one".