764665851 has 4 divisors (see below), whose sum is σ = 1019554472. Its totient is φ = 509777232.

The previous prime is 764665819. The next prime is 764665859. The reversal of 764665851 is 158566467.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158566467 = 3 ⋅52855489.

It is not a de Polignac number, because 764665851 - 2⁵ = 764665819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 764665851.

It is not an unprimeable number, because it can be changed into a prime (764665859) 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, 127444306 + ... + 127444311.

It is an arithmetic number, because the mean of its divisors is an integer number (254888618).

Almost surely, 2^764665851 is an apocalyptic number.

764665851 is a deficient number, since it is larger than the sum of its proper divisors (254888621).

764665851 is a wasteful number, since it uses less digits than its factorization.

764665851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254888620.

The product of its digits is 1209600, while the sum is 48.

The square root of 764665851 is about 27652.5921208121. The cubic root of 764665851 is about 914.4442467064. Note that the first 3 decimals are identical.

The spelling of 764665851 in words is "seven hundred sixty-four million, six hundred sixty-five thousand, eight hundred fifty-one".