145272773021 has 2 divisors, whose sum is σ = 145272773022. Its totient is φ = 145272773020.

The previous prime is 145272773017. The next prime is 145272773027. The reversal of 145272773021 is 120377272541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82937664121 + 62335108900 = 287989^2 + 249670^2 .

It is a cyclic number.

It is not a de Polignac number, because 145272773021 - 2² = 145272773017 is a prime.

It is a super-2 number, since 2×145272773021² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145272773021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145272773027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72636386510 + 72636386511.

It is an arithmetic number, because the mean of its divisors is an integer number (72636386511).

Almost surely, 2^145272773021 is an apocalyptic number.

It is an amenable number.

145272773021 is a deficient number, since it is larger than the sum of its proper divisors (1).

145272773021 is an equidigital number, since it uses as much as digits as its factorization.

145272773021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 145272773021 in words is "one hundred forty-five billion, two hundred seventy-two million, seven hundred seventy-three thousand, twenty-one".