2145816783 has 36 divisors (see below), whose sum is σ = 3413875920. Its totient is φ = 1297834560.

The previous prime is 2145816767. The next prime is 2145816793. The reversal of 2145816783 is 3876185412.

2145816783 is a `hidden beast` number, since 2 + 1 + 4 + 581 + 67 + 8 + 3 = 666.

It is not a de Polignac number, because 2145816783 - 2⁴ = 2145816767 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145816793) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 617910 + ... + 621372.

Almost surely, 2^2145816783 is an apocalyptic number.

2145816783 is a deficient number, since it is larger than the sum of its proper divisors (1268059137).

2145816783 is a wasteful number, since it uses less digits than its factorization.

2145816783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060 (or 4046 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 2145816783 is about 46322.9617252610. The cubic root of 2145816783 is about 1289.8252638751.

The spelling of 2145816783 in words is "two billion, one hundred forty-five million, eight hundred sixteen thousand, seven hundred eighty-three".