1545225511021 has 2 divisors, whose sum is σ = 1545225511022. Its totient is φ = 1545225511020.

The previous prime is 1545225510971. The next prime is 1545225511031. The reversal of 1545225511021 is 1201155225451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1005485502121 + 539740008900 = 1002739^2 + 734670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545225511021 - 2¹⁹ = 1545224986733 is a prime.

It is a super-2 number, since 2×1545225511021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1545225511031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772612755510 + 772612755511.

It is an arithmetic number, because the mean of its divisors is an integer number (772612755511).

Almost surely, 2^{1545225511021} is an apocalyptic number.

It is an amenable number.

1545225511021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545225511021 is an equidigital number, since it uses as much as digits as its factorization.

1545225511021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20000, while the sum is 34.

The spelling of 1545225511021 in words is "one trillion, five hundred forty-five billion, two hundred twenty-five million, five hundred eleven thousand, twenty-one".