72557679973 has 2 divisors, whose sum is σ = 72557679974. Its totient is φ = 72557679972.

The previous prime is 72557679967. The next prime is 72557680003. The reversal of 72557679973 is 37997675527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43637956609 + 28919723364 = 208897^2 + 170058^2 .

It is a cyclic number.

It is not a de Polignac number, because 72557679973 - 2⁹ = 72557679461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72557679899 and 72557679908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72557679913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36278839986 + 36278839987.

It is an arithmetic number, because the mean of its divisors is an integer number (36278839987).

Almost surely, 2^72557679973 is an apocalyptic number.

It is an amenable number.

72557679973 is a deficient number, since it is larger than the sum of its proper divisors (1).

72557679973 is an equidigital number, since it uses as much as digits as its factorization.

72557679973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 175032900, while the sum is 67.

The spelling of 72557679973 in words is "seventy-two billion, five hundred fifty-seven million, six hundred seventy-nine thousand, nine hundred seventy-three".