1543161645 has 16 divisors (see below), whose sum is σ = 2743398720. Its totient is φ = 823019472.

The previous prime is 1543161643. The next prime is 1543161667. The reversal of 1543161645 is 5461613451.

1543161645 is a `hidden beast` number, since 1 + 5 + 4 + 3 + 1 + 6 + 1 + 645 = 666.

It is not a de Polignac number, because 1543161645 - 2¹ = 1543161643 is a prime.

It is a super-3 number, since 3×1543161645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543161643) 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, 5715279 + ... + 5715548.

It is an arithmetic number, because the mean of its divisors is an integer number (171462420).

Almost surely, 2^1543161645 is an apocalyptic number.

1543161645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1543161645 is a deficient number, since it is larger than the sum of its proper divisors (1200237075).

1543161645 is a wasteful number, since it uses less digits than its factorization.

1543161645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11430841 (or 11430835 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1543161645 is about 39283.0961737997. The cubic root of 1543161645 is about 1155.5900847140.

It can be divided in two parts, 154316 and 1645, that added together give a triangular number (155961 = T₅₅₈).

The spelling of 1543161645 in words is "one billion, five hundred forty-three million, one hundred sixty-one thousand, six hundred forty-five".