6501021994 has 16 divisors (see below), whose sum is σ = 9980609760. Its totient is φ = 3174186960.

The previous prime is 6501021983. The next prime is 6501022019. The reversal of 6501021994 is 4991201056.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716949 + ... + 725959.

It is an arithmetic number, because the mean of its divisors is an integer number (623788110).

Almost surely, 2^6501021994 is an apocalyptic number.

6501021994 is a deficient number, since it is larger than the sum of its proper divisors (3479587766).

6501021994 is a wasteful number, since it uses less digits than its factorization.

6501021994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17445.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 6501021994 is about 80628.9153715961. The cubic root of 6501021994 is about 1866.3533836420.

The spelling of 6501021994 in words is "six billion, five hundred one million, twenty-one thousand, nine hundred ninety-four".