6543947890 has 16 divisors (see below), whose sum is σ = 12399059520. Its totient is φ = 2479811760.

The previous prime is 6543947867. The next prime is 6543947899. The reversal of 6543947890 is 987493456.

It is not an unprimeable number, because it can be changed into a prime (6543947899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17220726 + ... + 17221105.

It is an arithmetic number, because the mean of its divisors is an integer number (774941220).

Almost surely, 2^6543947890 is an apocalyptic number.

6543947890 is a deficient number, since it is larger than the sum of its proper divisors (5855111630).

6543947890 is a wasteful number, since it uses less digits than its factorization.

6543947890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34441857.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The square root of 6543947890 is about 80894.6715797771. The cubic root of 6543947890 is about 1870.4521855378.

The spelling of 6543947890 in words is "six billion, five hundred forty-three million, nine hundred forty-seven thousand, eight hundred ninety".