1621526243023 has 4 divisors (see below), whose sum is σ = 1692027384048. Its totient is φ = 1551025102000.

The previous prime is 1621526243017. The next prime is 1621526243039. The reversal of 1621526243023 is 3203426251261.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1621526243023 - 2¹⁷ = 1621526111951 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 (1621526243093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35250570478 + ... + 35250570523.

It is an arithmetic number, because the mean of its divisors is an integer number (423006846012).

Almost surely, 2^{1621526243023} is an apocalyptic number.

1621526243023 is a deficient number, since it is larger than the sum of its proper divisors (70501141025).

1621526243023 is an equidigital number, since it uses as much as digits as its factorization.

1621526243023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70501141024.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 1621526243023 in words is "one trillion, six hundred twenty-one billion, five hundred twenty-six million, two hundred forty-three thousand, twenty-three".