72411256473821 has 2 divisors, whose sum is σ = 72411256473822. Its totient is φ = 72411256473820.

The previous prime is 72411256473733. The next prime is 72411256473833. The reversal of 72411256473821 is 12837465211427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39478464009721 + 32932792464100 = 6283189^2 + 5738710^2 .

It is an emirp because it is prime and its reverse (12837465211427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72411256473821 - 2¹⁴ = 72411256457437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72411256473851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36205628236910 + 36205628236911.

It is an arithmetic number, because the mean of its divisors is an integer number (36205628236911).

Almost surely, 2^{72411256473821} is an apocalyptic number.

It is an amenable number.

72411256473821 is a deficient number, since it is larger than the sum of its proper divisors (1).

72411256473821 is an equidigital number, since it uses as much as digits as its factorization.

72411256473821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 53.

The spelling of 72411256473821 in words is "seventy-two trillion, four hundred eleven billion, two hundred fifty-six million, four hundred seventy-three thousand, eight hundred twenty-one".