72447977974429 has 2 divisors, whose sum is σ = 72447977974430. Its totient is φ = 72447977974428.

The previous prime is 72447977974399. The next prime is 72447977974439. The reversal of 72447977974429 is 92447977974427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43202054771929 + 29245923202500 = 6572827^2 + 5407950^2 .

It is a cyclic number.

It is not a de Polignac number, because 72447977974429 - 2²⁵ = 72447944419997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72447977974439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36223988987214 + 36223988987215.

It is an arithmetic number, because the mean of its divisors is an integer number (36223988987215).

Almost surely, 2^{72447977974429} is an apocalyptic number.

It is an amenable number.

72447977974429 is a deficient number, since it is larger than the sum of its proper divisors (1).

72447977974429 is an equidigital number, since it uses as much as digits as its factorization.

72447977974429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12546358272, while the sum is 82.

The spelling of 72447977974429 in words is "seventy-two trillion, four hundred forty-seven billion, nine hundred seventy-seven million, nine hundred seventy-four thousand, four hundred twenty-nine".