1645204897 has 16 divisors (see below), whose sum is σ = 1926136960. Its totient is φ = 1375823232.

The previous prime is 1645204843. The next prime is 1645204919. The reversal of 1645204897 is 7984025461.

It is a de Polignac number, because none of the positive numbers 2^k-1645204897 is a prime.

It is a super-2 number, since 2×1645204897² = 5413398306225561218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645204837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319213 + ... + 324325.

It is an arithmetic number, because the mean of its divisors is an integer number (120383560).

Almost surely, 2^1645204897 is an apocalyptic number.

It is an amenable number.

1645204897 is a deficient number, since it is larger than the sum of its proper divisors (280932063).

1645204897 is a wasteful number, since it uses less digits than its factorization.

1645204897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6232.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 1645204897 is about 40561.1254405003. The cubic root of 1645204897 is about 1180.5199511212.

The spelling of 1645204897 in words is "one billion, six hundred forty-five million, two hundred four thousand, eight hundred ninety-seven".