72783157529 has 2 divisors, whose sum is σ = 72783157530. Its totient is φ = 72783157528.

The previous prime is 72783157453. The next prime is 72783157561. The reversal of 72783157529 is 92575138727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63325206025 + 9457951504 = 251645^2 + 97252^2 .

It is a cyclic number.

It is not a de Polignac number, because 72783157529 - 2¹² = 72783153433 is a prime.

It is not a weakly prime, because it can be changed into another prime (72783157129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36391578764 + 36391578765.

It is an arithmetic number, because the mean of its divisors is an integer number (36391578765).

Almost surely, 2^72783157529 is an apocalyptic number.

It is an amenable number.

72783157529 is a deficient number, since it is larger than the sum of its proper divisors (1).

72783157529 is an equidigital number, since it uses as much as digits as its factorization.

72783157529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7408800, while the sum is 56.

The spelling of 72783157529 in words is "seventy-two billion, seven hundred eighty-three million, one hundred fifty-seven thousand, five hundred twenty-nine".