8065999981 has 8 divisors (see below), whose sum is σ = 8687304864. Its totient is φ = 7444815600.

The previous prime is 8065999961. The next prime is 8066000017. The reversal of 8065999981 is 1899995608.

8065999981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 8065999981 - 2¹⁵ = 8065967213 is a prime.

It is a super-2 number, since 2×8065999981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8065999951) 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, 147906 + ... + 194956.

It is an arithmetic number, because the mean of its divisors is an integer number (1085913108).

Almost surely, 2^8065999981 is an apocalyptic number.

It is an amenable number.

8065999981 is a deficient number, since it is larger than the sum of its proper divisors (621304883).

8065999981 is a wasteful number, since it uses less digits than its factorization.

8065999981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60251.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The square root of 8065999981 is about 89810.9123714930. The cubic root of 8065999981 is about 2005.4849423692.

The spelling of 8065999981 in words is "eight billion, sixty-five million, nine hundred ninety-nine thousand, nine hundred eighty-one".