1621554730153 has 2 divisors, whose sum is σ = 1621554730154. Its totient is φ = 1621554730152.

The previous prime is 1621554730111. The next prime is 1621554730163. The reversal of 1621554730153 is 3510374551261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929658499344 + 691896230809 = 964188^2 + 831803^2 .

It is an emirp because it is prime and its reverse (3510374551261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1621554730153 - 2²⁵ = 1621521175721 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621554730163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810777365076 + 810777365077.

It is an arithmetic number, because the mean of its divisors is an integer number (810777365077).

Almost surely, 2^{1621554730153} is an apocalyptic number.

It is an amenable number.

1621554730153 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621554730153 is an equidigital number, since it uses as much as digits as its factorization.

1621554730153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 1621554730153 in words is "one trillion, six hundred twenty-one billion, five hundred fifty-four million, seven hundred thirty thousand, one hundred fifty-three".