6561350078 has 4 divisors (see below), whose sum is σ = 9842025120. Its totient is φ = 3280675038.

The previous prime is 6561350077. The next prime is 6561350101. The reversal of 6561350078 is 8700531656.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561350077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640337518 + ... + 1640337521.

It is an arithmetic number, because the mean of its divisors is an integer number (2460506280).

Almost surely, 2^6561350078 is an apocalyptic number.

6561350078 is a deficient number, since it is larger than the sum of its proper divisors (3280675042).

6561350078 is a wasteful number, since it uses less digits than its factorization.

6561350078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280675041.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 6561350078 is about 81002.1609464834. The cubic root of 6561350078 is about 1872.1087365233.

The spelling of 6561350078 in words is "six billion, five hundred sixty-one million, three hundred fifty thousand, seventy-eight".