1645483871 has 8 divisors (see below), whose sum is σ = 1717908480. Its totient is φ = 1573132792.

The previous prime is 1645483849. The next prime is 1645483901. The reversal of 1645483871 is 1783845461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645483871 is a prime.

It is a super-2 number, since 2×1645483871² = 5415234339442289282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645483471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30110 + ... + 64788.

It is an arithmetic number, because the mean of its divisors is an integer number (214738560).

Almost surely, 2^1645483871 is an apocalyptic number.

1645483871 is a deficient number, since it is larger than the sum of its proper divisors (72424609).

1645483871 is a wasteful number, since it uses less digits than its factorization.

1645483871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36765.

The product of its digits is 645120, while the sum is 47.

The square root of 1645483871 is about 40564.5642279071. The cubic root of 1645483871 is about 1180.5866734608.

The spelling of 1645483871 in words is "one billion, six hundred forty-five million, four hundred eighty-three thousand, eight hundred seventy-one".