744665881 has 2 divisors, whose sum is σ = 744665882. Its totient is φ = 744665880.

The previous prime is 744665863. The next prime is 744665921. The reversal of 744665881 is 188566447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437855625 + 306810256 = 20925^2 + 17516^2 .

It is a cyclic number.

It is not a de Polignac number, because 744665881 - 2¹³ = 744657689 is a prime.

It is a super-2 number, since 2×744665881² = 1109054548651012322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (744665851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372332940 + 372332941.

It is an arithmetic number, because the mean of its divisors is an integer number (372332941).

Almost surely, 2^744665881 is an apocalyptic number.

It is an amenable number.

744665881 is a deficient number, since it is larger than the sum of its proper divisors (1).

744665881 is an equidigital number, since it uses as much as digits as its factorization.

744665881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 49.

The square root of 744665881 is about 27288.5668550036. The cubic root of 744665881 is about 906.4012280898.

The spelling of 744665881 in words is "seven hundred forty-four million, six hundred sixty-five thousand, eight hundred eighty-one".