72511781003 has 2 divisors, whose sum is σ = 72511781004. Its totient is φ = 72511781002.

The previous prime is 72511780949. The next prime is 72511781021. The reversal of 72511781003 is 30018711527.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72511781003 - 2¹⁰ = 72511779979 is a prime.

It is not a weakly prime, because it can be changed into another prime (72511781033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36255890501 + 36255890502.

It is an arithmetic number, because the mean of its divisors is an integer number (36255890502).

Almost surely, 2^72511781003 is an apocalyptic number.

72511781003 is a deficient number, since it is larger than the sum of its proper divisors (1).

72511781003 is an equidigital number, since it uses as much as digits as its factorization.

72511781003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 35.

The spelling of 72511781003 in words is "seventy-two billion, five hundred eleven million, seven hundred eighty-one thousand, three".