1621513046543 has 8 divisors (see below), whose sum is σ = 1822168507488. Its totient is φ = 1431703826784.

The previous prime is 1621513046383. The next prime is 1621513046561. The reversal of 1621513046543 is 3456403151261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1621513046543 - 2¹⁰ = 1621513045519 is a prime.

It is a super-2 number, since 2×1621513046543² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621513046543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621513046143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711559980 + ... + 2711560577.

It is an arithmetic number, because the mean of its divisors is an integer number (227771063436).

Almost surely, 2^{1621513046543} is an apocalyptic number.

1621513046543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1621513046543 is a deficient number, since it is larger than the sum of its proper divisors (200655460945).

1621513046543 is a wasteful number, since it uses less digits than its factorization.

1621513046543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423120593.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 1621513046543 in words is "one trillion, six hundred twenty-one billion, five hundred thirteen million, forty-six thousand, five hundred forty-three".