1644616797 has 4 divisors (see below), whose sum is σ = 2192822400. Its totient is φ = 1096411196.

The previous prime is 1644616783. The next prime is 1644616891. The reversal of 1644616797 is 7976164461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1644616797 - 2⁶ = 1644616733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644616747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274102797 + ... + 274102802.

It is an arithmetic number, because the mean of its divisors is an integer number (548205600).

Almost surely, 2^1644616797 is an apocalyptic number.

It is an amenable number.

1644616797 is a deficient number, since it is larger than the sum of its proper divisors (548205603).

1644616797 is an equidigital number, since it uses as much as digits as its factorization.

1644616797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548205602.

The product of its digits is 1524096, while the sum is 51.

The square root of 1644616797 is about 40553.8752402283. The cubic root of 1644616797 is about 1180.3792702602.

The spelling of 1644616797 in words is "one billion, six hundred forty-four million, six hundred sixteen thousand, seven hundred ninety-seven".