766647645 has 16 divisors (see below), whose sum is σ = 1255163712. Its totient is φ = 399369600.

The previous prime is 766647641. The next prime is 766647647. The reversal of 766647645 is 546746667.

It is not a de Polignac number, because 766647645 - 2² = 766647641 is a prime.

It is a super-2 number, since 2×766647645² = 1175497223168092050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766647641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593656 + ... + 594945.

It is an arithmetic number, because the mean of its divisors is an integer number (78447732).

Almost surely, 2^766647645 is an apocalyptic number.

It is an amenable number.

766647645 is a deficient number, since it is larger than the sum of its proper divisors (488516067).

766647645 is a wasteful number, since it uses less digits than its factorization.

766647645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188652.

The product of its digits is 5080320, while the sum is 51.

The square root of 766647645 is about 27688.4027166610. The cubic root of 766647645 is about 915.2335573870.

The spelling of 766647645 in words is "seven hundred sixty-six million, six hundred forty-seven thousand, six hundred forty-five".