766028722261 has 4 divisors (see below), whose sum is σ = 835667697024. Its totient is φ = 696389747500.

The previous prime is 766028722247. The next prime is 766028722271. The reversal of 766028722261 is 162227820667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162227820667 = 11 ⋅14747983697.

It is a cyclic number.

It is not a de Polignac number, because 766028722261 - 2³⁹ = 216272908373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766028722271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34819487365 + ... + 34819487386.

It is an arithmetic number, because the mean of its divisors is an integer number (208916924256).

Almost surely, 2^766028722261 is an apocalyptic number.

It is an amenable number.

766028722261 is a deficient number, since it is larger than the sum of its proper divisors (69638974763).

766028722261 is a wasteful number, since it uses less digits than its factorization.

766028722261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69638974762.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 766028722261 in words is "seven hundred sixty-six billion, twenty-eight million, seven hundred twenty-two thousand, two hundred sixty-one".