1621057443453 has 48 divisors (see below), whose sum is σ = 2796724869120. Its totient is φ = 884665327392.

The previous prime is 1621057443437. The next prime is 1621057443461. The reversal of 1621057443453 is 3543447501261.

1621057443453 is a `hidden beast` number, since 1 + 6 + 21 + 0 + 574 + 4 + 3 + 4 + 53 = 666.

It is not a de Polignac number, because 1621057443453 - 2⁴ = 1621057443437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621057443399 and 1621057443408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621057443413) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61768 + ... + 1801646.

It is an arithmetic number, because the mean of its divisors is an integer number (58265101440).

Almost surely, 2^{1621057443453} is an apocalyptic number.

It is an amenable number.

1621057443453 is a deficient number, since it is larger than the sum of its proper divisors (1175667425667).

1621057443453 is a wasteful number, since it uses less digits than its factorization.

1621057443453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740558 (or 1740555 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 1621057443453 in words is "one trillion, six hundred twenty-one billion, fifty-seven million, four hundred forty-three thousand, four hundred fifty-three".