76781773509 has 16 divisors (see below), whose sum is σ = 117005471232. Its totient is φ = 43873546608.

The previous prime is 76781773489. The next prime is 76781773511. The reversal of 76781773509 is 90537718767.

It is not a de Polignac number, because 76781773509 - 2¹² = 76781769413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76781773529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 616762 + ... + 730724.

It is an arithmetic number, because the mean of its divisors is an integer number (7312841952).

Almost surely, 2^76781773509 is an apocalyptic number.

It is an amenable number.

76781773509 is a deficient number, since it is larger than the sum of its proper divisors (40223697723).

76781773509 is a wasteful number, since it uses less digits than its factorization.

76781773509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146056.

The product of its (nonzero) digits is 15558480, while the sum is 60.

The spelling of 76781773509 in words is "seventy-six billion, seven hundred eighty-one million, seven hundred seventy-three thousand, five hundred nine".