1645996887 has 6 divisors (see below), whose sum is σ = 2377551072. Its totient is φ = 1097331252.

The previous prime is 1645996873. The next prime is 1645996903. The reversal of 1645996887 is 7886995461.

1645996887 is a `hidden beast` number, since 16 + 459 + 96 + 8 + 87 = 666.

It is not a de Polignac number, because 1645996887 - 2¹⁶ = 1645931351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645996487) 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, 91444263 + ... + 91444280.

It is an arithmetic number, because the mean of its divisors is an integer number (396258512).

Almost surely, 2^1645996887 is an apocalyptic number.

1645996887 is a deficient number, since it is larger than the sum of its proper divisors (731554185).

1645996887 is a wasteful number, since it uses less digits than its factorization.

1645996887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182888549 (or 182888546 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The square root of 1645996887 is about 40570.8871852712. The cubic root of 1645996887 is about 1180.7093520503.

The spelling of 1645996887 in words is "one billion, six hundred forty-five million, nine hundred ninety-six thousand, eight hundred eighty-seven".