1643461263 has 12 divisors (see below), whose sum is σ = 2378977848. Its totient is φ = 1093291920.

The previous prime is 1643461243. The next prime is 1643461277. The reversal of 1643461263 is 3621643461.

1643461263 is a `hidden beast` number, since 1 + 6 + 4 + 34 + 612 + 6 + 3 = 666.

It is not a de Polignac number, because 1643461263 - 2⁵ = 1643461231 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643461243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191308 + ... + 199713.

It is an arithmetic number, because the mean of its divisors is an integer number (198248154).

Almost surely, 2^1643461263 is an apocalyptic number.

1643461263 is a deficient number, since it is larger than the sum of its proper divisors (735516585).

1643461263 is a wasteful number, since it uses less digits than its factorization.

1643461263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391494 (or 391491 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 1643461263 is about 40539.6258369512. The cubic root of 1643461263 is about 1180.1027543862.

The spelling of 1643461263 in words is "one billion, six hundred forty-three million, four hundred sixty-one thousand, two hundred sixty-three".