94019967981 has 24 divisors (see below), whose sum is σ = 136096233624. Its totient is φ = 62546440320.

The previous prime is 94019967953. The next prime is 94019968019. The reversal of 94019967981 is 18976991049.

94019967981 is a `hidden beast` number, since 9 + 401 + 99 + 67 + 9 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 73264955625 + 20755012356 = 270675^2 + 144066^2 .

It is not a de Polignac number, because 94019967981 - 2⁹ = 94019967469 is a prime.

It is a super-2 number, since 2×94019967981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (94019967941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11432451 + ... + 11440671.

It is an arithmetic number, because the mean of its divisors is an integer number (5670676401).

Almost surely, 2^94019967981 is an apocalyptic number.

It is an amenable number.

94019967981 is a deficient number, since it is larger than the sum of its proper divisors (42076265643).

94019967981 is a wasteful number, since it uses less digits than its factorization.

94019967981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10781 (or 10778 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 63.

The spelling of 94019967981 in words is "ninety-four billion, nineteen million, nine hundred sixty-seven thousand, nine hundred eighty-one".