16245536643 has 48 divisors (see below), whose sum is σ = 27107510976. Its totient is φ = 9183283200.

The previous prime is 16245536561. The next prime is 16245536669. The reversal of 16245536643 is 34663554261.

16245536643 is a `hidden beast` number, since 1 + 6 + 245 + 5 + 366 + 43 = 666.

It is not a de Polignac number, because 16245536643 - 2¹⁰ = 16245535619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16245526643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4276621 + ... + 4280417.

It is an arithmetic number, because the mean of its divisors is an integer number (564739812).

Almost surely, 2^16245536643 is an apocalyptic number.

16245536643 is a deficient number, since it is larger than the sum of its proper divisors (10861974333).

16245536643 is a wasteful number, since it uses less digits than its factorization.

16245536643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4524 (or 4521 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The spelling of 16245536643 in words is "sixteen billion, two hundred forty-five million, five hundred thirty-six thousand, six hundred forty-three".