76821164649 has 12 divisors (see below), whose sum is σ = 112620083056. Its totient is φ = 50449719672.

The previous prime is 76821164603. The next prime is 76821164669. The reversal of 76821164649 is 94646112867.

76821164649 is a `hidden beast` number, since 7 + 68 + 2 + 116 + 464 + 9 = 666.

It is not a de Polignac number, because 76821164649 - 2⁹ = 76821164137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 76821164595 and 76821164604.

It is not an unprimeable number, because it can be changed into a prime (76821164669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63698539 + ... + 63699744.

Almost surely, 2^76821164649 is an apocalyptic number.

It is an amenable number.

76821164649 is a deficient number, since it is larger than the sum of its proper divisors (35798918407).

76821164649 is a wasteful number, since it uses less digits than its factorization.

76821164649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127398356 (or 127398353 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 76821164649 in words is "seventy-six billion, eight hundred twenty-one million, one hundred sixty-four thousand, six hundred forty-nine".