145653561421 has 2 divisors, whose sum is σ = 145653561422. Its totient is φ = 145653561420.

The previous prime is 145653561419. The next prime is 145653561517. The reversal of 145653561421 is 124165356541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76767784900 + 68885776521 = 277070^2 + 262461^2 .

It is an emirp because it is prime and its reverse (124165356541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145653561421 - 2¹ = 145653561419 is a prime.

Together with 145653561419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145653561821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72826780710 + 72826780711.

It is an arithmetic number, because the mean of its divisors is an integer number (72826780711).

Almost surely, 2^145653561421 is an apocalyptic number.

It is an amenable number.

145653561421 is a deficient number, since it is larger than the sum of its proper divisors (1).

145653561421 is an equidigital number, since it uses as much as digits as its factorization.

145653561421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The spelling of 145653561421 in words is "one hundred forty-five billion, six hundred fifty-three million, five hundred sixty-one thousand, four hundred twenty-one".