72271780733 has 2 divisors, whose sum is σ = 72271780734. Its totient is φ = 72271780732.

The previous prime is 72271780729. The next prime is 72271780771. The reversal of 72271780733 is 33708717227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71629563769 + 642216964 = 267637^2 + 25342^2 .

It is a cyclic number.

It is not a de Polignac number, because 72271780733 - 2² = 72271780729 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72271780703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36135890366 + 36135890367.

It is an arithmetic number, because the mean of its divisors is an integer number (36135890367).

Almost surely, 2^72271780733 is an apocalyptic number.

It is an amenable number.

72271780733 is a deficient number, since it is larger than the sum of its proper divisors (1).

72271780733 is an equidigital number, since it uses as much as digits as its factorization.

72271780733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691488, while the sum is 47.

The spelling of 72271780733 in words is "seventy-two billion, two hundred seventy-one million, seven hundred eighty thousand, seven hundred thirty-three".