742942626721 has 2 divisors, whose sum is σ = 742942626722. Its totient is φ = 742942626720.

The previous prime is 742942626719. The next prime is 742942626739. The reversal of 742942626721 is 127626249247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514110510225 + 228832116496 = 717015^2 + 478364^2 .

It is a cyclic number.

It is not a de Polignac number, because 742942626721 - 2¹ = 742942626719 is a prime.

Together with 742942626719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (742942626781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371471313360 + 371471313361.

It is an arithmetic number, because the mean of its divisors is an integer number (371471313361).

Almost surely, 2^742942626721 is an apocalyptic number.

It is an amenable number.

742942626721 is a deficient number, since it is larger than the sum of its proper divisors (1).

742942626721 is an equidigital number, since it uses as much as digits as its factorization.

742942626721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 52.

The spelling of 742942626721 in words is "seven hundred forty-two billion, nine hundred forty-two million, six hundred twenty-six thousand, seven hundred twenty-one".