743515454421 has 20 divisors (see below), whose sum is σ = 1112268092364. Its totient is φ = 494969832000.

The previous prime is 743515454411. The next prime is 743515454459. The reversal of 743515454421 is 124454515347.

It is a happy number.

743515454421 is a `hidden beast` number, since 7 + 4 + 3 + 51 + 54 + 544 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 686761921521 + 56753532900 = 828711^2 + 238230^2 .

It is not a de Polignac number, because 743515454421 - 2¹⁹ = 743514930133 is a prime.

It is a super-2 number, since 2×743515454421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743515454411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6490440 + ... + 6604001.

Almost surely, 2^743515454421 is an apocalyptic number.

It is an amenable number.

743515454421 is a deficient number, since it is larger than the sum of its proper divisors (368752637943).

743515454421 is a wasteful number, since it uses less digits than its factorization.

743515454421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13095154 (or 13095145 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 45.

Adding to 743515454421 its reverse (124454515347), we get a palindrome (867969969768).

The spelling of 743515454421 in words is "seven hundred forty-three billion, five hundred fifteen million, four hundred fifty-four thousand, four hundred twenty-one".