6561958 has 8 divisors (see below), whose sum is σ = 10600128. Its totient is φ = 3028584.

The previous prime is 6561943. The next prime is 6561991. The reversal of 6561958 is 8591656.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6561958.

It is a congruent number.

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, 126166 + ... + 126217.

It is an arithmetic number, because the mean of its divisors is an integer number (1325016).

Almost surely, 2^6561958 is an apocalyptic number.

6561958 is a deficient number, since it is larger than the sum of its proper divisors (4038170).

6561958 is a wasteful number, since it uses less digits than its factorization.

6561958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252398.

The product of its digits is 64800, while the sum is 40.

The square root of 6561958 is about 2561.6319017376. The cubic root of 6561958 is about 187.2166552924.

The spelling of 6561958 in words is "six million, five hundred sixty-one thousand, nine hundred fifty-eight".