766506626021 has 2 divisors, whose sum is σ = 766506626022. Its totient is φ = 766506626020.

The previous prime is 766506625993. The next prime is 766506626033. The reversal of 766506626021 is 120626605667.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 750370005121 + 16136620900 = 866239^2 + 127030^2 .

It is a cyclic number.

It is not a de Polignac number, because 766506626021 - 2²⁶ = 766439517157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766506026021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383253313010 + 383253313011.

It is an arithmetic number, because the mean of its divisors is an integer number (383253313011).

Almost surely, 2^766506626021 is an apocalyptic number.

It is an amenable number.

766506626021 is a deficient number, since it is larger than the sum of its proper divisors (1).

766506626021 is an equidigital number, since it uses as much as digits as its factorization.

766506626021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 766506626021 in words is "seven hundred sixty-six billion, five hundred six million, six hundred twenty-six thousand, twenty-one".