6561708394 has 8 divisors (see below), whose sum is σ = 9845363808. Its totient is φ = 3279920460.

The previous prime is 6561708379. The next prime is 6561708409. The reversal of 6561708394 is 4938071656.

It is an interprime number because it is at equal distance from previous prime (6561708379) and next prime (6561708409).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458052 + ... + 472159.

It is an arithmetic number, because the mean of its divisors is an integer number (1230670476).

Almost surely, 2^6561708394 is an apocalyptic number.

6561708394 is a deficient number, since it is larger than the sum of its proper divisors (3283655414).

6561708394 is a wasteful number, since it uses less digits than its factorization.

6561708394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933740.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 6561708394 is about 81004.3726844422. The cubic root of 6561708394 is about 1872.1428145863.

The spelling of 6561708394 in words is "six billion, five hundred sixty-one million, seven hundred eight thousand, three hundred ninety-four".