1601515605618 has 48 divisors (see below), whose sum is σ = 3475071600000. Its totient is φ = 533051215200.

The previous prime is 1601515605611. The next prime is 1601515605619. The reversal of 1601515605618 is 8165065151061.

1601515605618 is a `hidden beast` number, since 1 + 6 + 0 + 15 + 15 + 6 + 0 + 5 + 618 = 666.

It is not an unprimeable number, because it can be changed into a prime (1601515605611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37795908 + ... + 37838256.

It is an arithmetic number, because the mean of its divisors is an integer number (72397325000).

Almost surely, 2^{1601515605618} is an apocalyptic number.

1601515605618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1601515605618 is an abundant number, since it is smaller than the sum of its proper divisors (1873555994382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1601515605618 is a wasteful number, since it uses less digits than its factorization.

1601515605618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45407 (or 45404 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 45.

The spelling of 1601515605618 in words is "one trillion, six hundred one billion, five hundred fifteen million, six hundred five thousand, six hundred eighteen".