6781520669 has 48 divisors (see below), whose sum is σ = 8896257216. Its totient is φ = 5108544000.

The previous prime is 6781520659. The next prime is 6781520693. The reversal of 6781520669 is 9660251876.

It is not a de Polignac number, because 6781520669 - 2⁴ = 6781520653 is a prime.

It is a super-2 number, since 2×6781520669² = 91978045168148415122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781520659) 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 47 ways as a sum of consecutive naturals, for example, 2339429 + ... + 2342325.

It is an arithmetic number, because the mean of its divisors is an integer number (185338692).

Almost surely, 2^6781520669 is an apocalyptic number.

It is an amenable number.

6781520669 is a deficient number, since it is larger than the sum of its proper divisors (2114736547).

6781520669 is a wasteful number, since it uses less digits than its factorization.

6781520669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066 (or 3059 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 6781520669 is about 82349.9888828165. The cubic root of 6781520669 is about 1892.8187524037.

The spelling of 6781520669 in words is "six billion, seven hundred eighty-one million, five hundred twenty thousand, six hundred sixty-nine".