72909019423 has 2 divisors, whose sum is σ = 72909019424. Its totient is φ = 72909019422.

The previous prime is 72909019411. The next prime is 72909019453. The reversal of 72909019423 is 32491090927.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72909019423 - 2⁹ = 72909018911 is a prime.

It is a super-2 number, since 2×72909019423² (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 (72909019453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36454509711 + 36454509712.

It is an arithmetic number, because the mean of its divisors is an integer number (36454509712).

Almost surely, 2^72909019423 is an apocalyptic number.

72909019423 is a deficient number, since it is larger than the sum of its proper divisors (1).

72909019423 is an equidigital number, since it uses as much as digits as its factorization.

72909019423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 72909019423 in words is "seventy-two billion, nine hundred nine million, nineteen thousand, four hundred twenty-three".