145621665577 has 2 divisors, whose sum is σ = 145621665578. Its totient is φ = 145621665576.

The previous prime is 145621665529. The next prime is 145621665587. The reversal of 145621665577 is 775566126541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143598555136 + 2023110441 = 378944^2 + 44979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145621665577 is a prime.

It is not a weakly prime, because it can be changed into another prime (145621665587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810832788 + 72810832789.

It is an arithmetic number, because the mean of its divisors is an integer number (72810832789).

Almost surely, 2^145621665577 is an apocalyptic number.

It is an amenable number.

145621665577 is a deficient number, since it is larger than the sum of its proper divisors (1).

145621665577 is an equidigital number, since it uses as much as digits as its factorization.

145621665577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584000, while the sum is 55.

The spelling of 145621665577 in words is "one hundred forty-five billion, six hundred twenty-one million, six hundred sixty-five thousand, five hundred seventy-seven".