6641070981 has 16 divisors (see below), whose sum is σ = 9198499968. Its totient is φ = 4258553600.

The previous prime is 6641070979. The next prime is 6641071009. The reversal of 6641070981 is 1890701466.

It is a cyclic number.

It is not a de Polignac number, because 6641070981 - 2¹ = 6641070979 is a prime.

It is a super-2 number, since 2×6641070981² = 88207647549360604722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641070941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371496 + ... + 388961.

It is an arithmetic number, because the mean of its divisors is an integer number (574906248).

Almost surely, 2^6641070981 is an apocalyptic number.

It is an amenable number.

6641070981 is a deficient number, since it is larger than the sum of its proper divisors (2557428987).

6641070981 is a wasteful number, since it uses less digits than its factorization.

6641070981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760572.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 6641070981 is about 81492.7664335921. The cubic root of 6641070981 is about 1879.6603223830.

The spelling of 6641070981 in words is "six billion, six hundred forty-one million, seventy thousand, nine hundred eighty-one".