742755564581 has 2 divisors, whose sum is σ = 742755564582. Its totient is φ = 742755564580.

The previous prime is 742755564571. The next prime is 742755564673. The reversal of 742755564581 is 185465557247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729888292225 + 12867272356 = 854335^2 + 113434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-742755564581 is a prime.

It is a super-2 number, since 2×742755564581² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 742755564581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (742755564521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371377782290 + 371377782291.

It is an arithmetic number, because the mean of its divisors is an integer number (371377782291).

Almost surely, 2^742755564581 is an apocalyptic number.

It is an amenable number.

742755564581 is a deficient number, since it is larger than the sum of its proper divisors (1).

742755564581 is an equidigital number, since it uses as much as digits as its factorization.

742755564581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040000, while the sum is 59.

The spelling of 742755564581 in words is "seven hundred forty-two billion, seven hundred fifty-five million, five hundred sixty-four thousand, five hundred eighty-one".