165604066545 has 16 divisors (see below), whose sum is σ = 265099104000. Its totient is φ = 88277969664.

The previous prime is 165604066541. The next prime is 165604066583. The reversal of 165604066545 is 545660406561.

It is not a de Polignac number, because 165604066545 - 2² = 165604066541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165604066494 and 165604066503.

It is not an unprimeable number, because it can be changed into a prime (165604066541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2731464 + ... + 2791433.

It is an arithmetic number, because the mean of its divisors is an integer number (16568694000).

Almost surely, 2^165604066545 is an apocalyptic number.

165604066545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165604066545 is a deficient number, since it is larger than the sum of its proper divisors (99495037455).

165604066545 is a wasteful number, since it uses less digits than its factorization.

165604066545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524904.

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 165604066545 in words is "one hundred sixty-five billion, six hundred four million, sixty-six thousand, five hundred forty-five".