72434945981 has 2 divisors, whose sum is σ = 72434945982. Its totient is φ = 72434945980.

The previous prime is 72434945977. The next prime is 72434946097. The reversal of 72434945981 is 18954943427.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72433109956 + 1836025 = 269134^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 72434945981 - 2² = 72434945977 is a prime.

It is a super-2 number, since 2×72434945981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72434945911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36217472990 + 36217472991.

It is an arithmetic number, because the mean of its divisors is an integer number (36217472991).

Almost surely, 2^72434945981 is an apocalyptic number.

It is an amenable number.

72434945981 is a deficient number, since it is larger than the sum of its proper divisors (1).

72434945981 is an equidigital number, since it uses as much as digits as its factorization.

72434945981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 56.

The spelling of 72434945981 in words is "seventy-two billion, four hundred thirty-four million, nine hundred forty-five thousand, nine hundred eighty-one".