766478374021 has 4 divisors (see below), whose sum is σ = 776180632000. Its totient is φ = 756776116044.

The previous prime is 766478374003. The next prime is 766478374091. The reversal of 766478374021 is 120473874667.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 766478374021 - 2⁹ = 766478373509 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 (766478374091) 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, 4851128871 + ... + 4851129028.

It is an arithmetic number, because the mean of its divisors is an integer number (194045158000).

Almost surely, 2^766478374021 is an apocalyptic number.

It is an amenable number.

766478374021 is a deficient number, since it is larger than the sum of its proper divisors (9702257979).

766478374021 is an equidigital number, since it uses as much as digits as its factorization.

766478374021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9702257978.

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 766478374021 in words is "seven hundred sixty-six billion, four hundred seventy-eight million, three hundred seventy-four thousand, twenty-one".