6561038701 has 12 divisors (see below), whose sum is σ = 8081184348. Its totient is φ = 5292938112.

The previous prime is 6561038689. The next prime is 6561038749. The reversal of 6561038701 is 1078301656.

It can be written as a sum of positive squares in 2 ways, for example, as 3369918601 + 3191120100 = 58051^2 + 56490^2 .

It is not a de Polignac number, because 6561038701 - 2⁵ = 6561038669 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561038761) 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, 3937366 + ... + 3939031.

It is an arithmetic number, because the mean of its divisors is an integer number (673432029).

Almost surely, 2^6561038701 is an apocalyptic number.

It is an amenable number.

6561038701 is a deficient number, since it is larger than the sum of its proper divisors (1520145647).

6561038701 is a wasteful number, since it uses less digits than its factorization.

6561038701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7876428 (or 7876421 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 6561038701 is about 81000.2388947094. The cubic root of 6561038701 is about 1872.0791216414.

The spelling of 6561038701 in words is "six billion, five hundred sixty-one million, thirty-eight thousand, seven hundred one".