744961405391 has 16 divisors (see below), whose sum is σ = 857286566400. Its totient is φ = 634114375200.

The previous prime is 744961405381. The next prime is 744961405393. The reversal of 744961405391 is 193504169447.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 744961405391 - 2¹⁸ = 744961143247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744961405393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3380225 + ... + 3593861.

It is an arithmetic number, because the mean of its divisors is an integer number (53580410400).

Almost surely, 2^744961405391 is an apocalyptic number.

744961405391 is a deficient number, since it is larger than the sum of its proper divisors (112325161009).

744961405391 is a wasteful number, since it uses less digits than its factorization.

744961405391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217094.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 744961405391 in words is "seven hundred forty-four billion, nine hundred sixty-one million, four hundred five thousand, three hundred ninety-one".