6781011657 has 24 divisors (see below), whose sum is σ = 10546229376. Its totient is φ = 3864274848.

The previous prime is 6781011619. The next prime is 6781011661. The reversal of 6781011657 is 7561101876.

It is a happy number.

It is not a de Polignac number, because 6781011657 - 2⁸ = 6781011401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6781011617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8898 + ... + 116795.

It is an arithmetic number, because the mean of its divisors is an integer number (439426224).

Almost surely, 2^6781011657 is an apocalyptic number.

It is an amenable number.

6781011657 is a deficient number, since it is larger than the sum of its proper divisors (3765217719).

6781011657 is a wasteful number, since it uses less digits than its factorization.

6781011657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126077 (or 126070 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 6781011657 is about 82346.8982840277. The cubic root of 6781011657 is about 1892.7713937255.

The spelling of 6781011657 in words is "six billion, seven hundred eighty-one million, eleven thousand, six hundred fifty-seven".