766818870797 has 4 divisors (see below), whose sum is σ = 876364423776. Its totient is φ = 657273317820.

The previous prime is 766818870787. The next prime is 766818870799. The reversal of 766818870797 is 797078818667.

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.

It is not a de Polignac number, because 766818870797 - 2⁸ = 766818870541 is a prime.

It is a super-2 number, since 2×766818870797² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766818870799) 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, 54772776479 + ... + 54772776492.

It is an arithmetic number, because the mean of its divisors is an integer number (219091105944).

Almost surely, 2^766818870797 is an apocalyptic number.

It is an amenable number.

766818870797 is a deficient number, since it is larger than the sum of its proper divisors (109545552979).

766818870797 is a wasteful number, since it uses less digits than its factorization.

766818870797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109545552978.

The product of its (nonzero) digits is 398297088, while the sum is 74.

The spelling of 766818870797 in words is "seven hundred sixty-six billion, eight hundred eighteen million, eight hundred seventy thousand, seven hundred ninety-seven".