145221116461 has 2 divisors, whose sum is σ = 145221116462. Its totient is φ = 145221116460.

The previous prime is 145221116459. The next prime is 145221116477. The reversal of 145221116461 is 164611122541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144908887561 + 312228900 = 380669^2 + 17670^2 .

It is a cyclic number.

It is not a de Polignac number, because 145221116461 - 2¹ = 145221116459 is a prime.

Together with 145221116459, 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 (145221116431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72610558230 + 72610558231.

It is an arithmetic number, because the mean of its divisors is an integer number (72610558231).

Almost surely, 2^145221116461 is an apocalyptic number.

It is an amenable number.

145221116461 is a deficient number, since it is larger than the sum of its proper divisors (1).

145221116461 is an equidigital number, since it uses as much as digits as its factorization.

145221116461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The spelling of 145221116461 in words is "one hundred forty-five billion, two hundred twenty-one million, one hundred sixteen thousand, four hundred sixty-one".