1645420753 has 2 divisors, whose sum is σ = 1645420754. Its totient is φ = 1645420752.

The previous prime is 1645420739. The next prime is 1645420783. The reversal of 1645420753 is 3570245461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1611861904 + 33558849 = 40148^2 + 5793^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645420753 - 2²¹ = 1643323601 is a prime.

It is a super-3 number, since 3×1645420753³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1645420783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822710376 + 822710377.

It is an arithmetic number, because the mean of its divisors is an integer number (822710377).

Almost surely, 2^1645420753 is an apocalyptic number.

It is an amenable number.

1645420753 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645420753 is an equidigital number, since it uses as much as digits as its factorization.

1645420753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 1645420753 is about 40563.7862261402. The cubic root of 1645420753 is about 1180.5715781599.

The spelling of 1645420753 in words is "one billion, six hundred forty-five million, four hundred twenty thousand, seven hundred fifty-three".