168561513603 has 48 divisors (see below), whose sum is σ = 290863213056. Its totient is φ = 91972869120.

The previous prime is 168561513583. The next prime is 168561513607. The reversal of 168561513603 is 306315165861.

168561513603 is a `hidden beast` number, since 1 + 6 + 8 + 561 + 51 + 36 + 0 + 3 = 666.

It is not a de Polignac number, because 168561513603 - 2¹² = 168561509507 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (168561513607) 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, 735268 + ... + 936878.

It is an arithmetic number, because the mean of its divisors is an integer number (6059650272).

Almost surely, 2^168561513603 is an apocalyptic number.

168561513603 is a deficient number, since it is larger than the sum of its proper divisors (122301699453).

168561513603 is a wasteful number, since it uses less digits than its factorization.

168561513603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202224 (or 202221 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 168561513603 in words is "one hundred sixty-eight billion, five hundred sixty-one million, five hundred thirteen thousand, six hundred three".