743685456641 has 4 divisors (see below), whose sum is σ = 743691988992. Its totient is φ = 743678924292.

The previous prime is 743685456629. The next prime is 743685456653. The reversal of 743685456641 is 146654586347.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146654586347 = 487 ⋅301138781.

It is an interprime number because it is at equal distance from previous prime (743685456629) and next prime (743685456653).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743685456641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (743685456611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3092321 + ... + 3324126.

It is an arithmetic number, because the mean of its divisors is an integer number (185922997248).

Almost surely, 2^743685456641 is an apocalyptic number.

It is an amenable number.

743685456641 is a deficient number, since it is larger than the sum of its proper divisors (6532351).

743685456641 is a wasteful number, since it uses less digits than its factorization.

743685456641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532350.

The product of its digits is 58060800, while the sum is 59.

The spelling of 743685456641 in words is "seven hundred forty-three billion, six hundred eighty-five million, four hundred fifty-six thousand, six hundred forty-one".