1643504156 has 48 divisors (see below), whose sum is σ = 3314302656. Its totient is φ = 698540544.

The previous prime is 1643504117. The next prime is 1643504201. The reversal of 1643504156 is 6514053461.

It is a super-2 number, since 2×1643504156² = 5402211821578544672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2427290 + ... + 2427966.

It is an arithmetic number, because the mean of its divisors is an integer number (69047972).

Almost surely, 2^1643504156 is an apocalyptic number.

It is an amenable number.

1643504156 is an abundant number, since it is smaller than the sum of its proper divisors (1670798500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643504156 is a wasteful number, since it uses less digits than its factorization.

1643504156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1643504156 is about 40540.1548591024. The cubic root of 1643504156 is about 1180.1130208703.

The spelling of 1643504156 in words is "one billion, six hundred forty-three million, five hundred four thousand, one hundred fifty-six".