6740711561 has 4 divisors (see below), whose sum is σ = 6867894852. Its totient is φ = 6613528272.

The previous prime is 6740711557. The next prime is 6740711569. The reversal of 6740711561 is 1651170476.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3196771600 + 3543939961 = 56540^2 + 59531^2 .

It is a cyclic number.

It is not a de Polignac number, because 6740711561 - 2² = 6740711557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6740711569) 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, 63591566 + ... + 63591671.

It is an arithmetic number, because the mean of its divisors is an integer number (1716973713).

Almost surely, 2^6740711561 is an apocalyptic number.

It is an amenable number.

6740711561 is a deficient number, since it is larger than the sum of its proper divisors (127183291).

6740711561 is a wasteful number, since it uses less digits than its factorization.

6740711561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127183290.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 6740711561 is about 82101.8365263531. The cubic root of 6740711561 is about 1889.0143102633.

The spelling of 6740711561 in words is "six billion, seven hundred forty million, seven hundred eleven thousand, five hundred sixty-one".