7421728637489 has 2 divisors, whose sum is σ = 7421728637490. Its totient is φ = 7421728637488.

The previous prime is 7421728637443. The next prime is 7421728637591. The reversal of 7421728637489 is 9847368271247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3751504134400 + 3670224503089 = 1936880^2 + 1915783^2 .

It is a cyclic number.

It is not a de Polignac number, because 7421728637489 - 2¹² = 7421728633393 is a prime.

It is not a weakly prime, because it can be changed into another prime (7421728630489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3710864318744 + 3710864318745.

It is an arithmetic number, because the mean of its divisors is an integer number (3710864318745).

Almost surely, 2^{7421728637489} is an apocalyptic number.

It is an amenable number.

7421728637489 is a deficient number, since it is larger than the sum of its proper divisors (1).

7421728637489 is an equidigital number, since it uses as much as digits as its factorization.

7421728637489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 227598336, while the sum is 68.

The spelling of 7421728637489 in words is "seven trillion, four hundred twenty-one billion, seven hundred twenty-eight million, six hundred thirty-seven thousand, four hundred eighty-nine".