1645201357 has 2 divisors, whose sum is σ = 1645201358. Its totient is φ = 1645201356.

The previous prime is 1645201277. The next prime is 1645201361. The reversal of 1645201357 is 7531025461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1521858121 + 123343236 = 39011^2 + 11106^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645201357 - 2²⁷ = 1510983629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645201057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822600678 + 822600679.

It is an arithmetic number, because the mean of its divisors is an integer number (822600679).

Almost surely, 2^1645201357 is an apocalyptic number.

It is an amenable number.

1645201357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645201357 is an equidigital number, since it uses as much as digits as its factorization.

1645201357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1645201357 is about 40561.0818026344. The cubic root of 1645201357 is about 1180.5191044093.

The spelling of 1645201357 in words is "one billion, six hundred forty-five million, two hundred one thousand, three hundred fifty-seven".