1645540713 has 6 divisors (see below), whose sum is σ = 2376892154. Its totient is φ = 1097027136.

The previous prime is 1645540711. The next prime is 1645540717. The reversal of 1645540713 is 3170455461.

1645540713 is a `hidden beast` number, since 1 + 6 + 45 + 540 + 71 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1623525849 + 22014864 = 40293^2 + 4692^2 .

It is not a de Polignac number, because 1645540713 - 2¹ = 1645540711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645540711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91418920 + ... + 91418937.

Almost surely, 2^1645540713 is an apocalyptic number.

It is an amenable number.

1645540713 is a deficient number, since it is larger than the sum of its proper divisors (731351441).

1645540713 is a wasteful number, since it uses less digits than its factorization.

1645540713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182837863 (or 182837860 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 1645540713 is about 40565.2648580038. The cubic root of 1645540713 is about 1180.6002674632.

The spelling of 1645540713 in words is "one billion, six hundred forty-five million, five hundred forty thousand, seven hundred thirteen".