1645026001 has 2 divisors, whose sum is σ = 1645026002. Its totient is φ = 1645026000.

The previous prime is 1645025999. The next prime is 1645026013. The reversal of 1645026001 is 1006205461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1361979025 + 283046976 = 36905^2 + 16824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645026001 - 2¹ = 1645025999 is a prime.

It is a super-2 number, since 2×1645026001² = 5412221087932104002, which contains 22 as substring.

Together with 1645025999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1645026041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822513000 + 822513001.

It is an arithmetic number, because the mean of its divisors is an integer number (822513001).

Almost surely, 2^1645026001 is an apocalyptic number.

It is an amenable number.

1645026001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645026001 is an equidigital number, since it uses as much as digits as its factorization.

1645026001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1645026001 is about 40558.9201162950. The cubic root of 1645026001 is about 1180.4771605134.

The spelling of 1645026001 in words is "one billion, six hundred forty-five million, twenty-six thousand, one".