161797545 has 48 divisors (see below), whose sum is σ = 345176832. Its totient is φ = 68273280.

The previous prime is 161797507. The next prime is 161797553. The reversal of 161797545 is 545797161.

161797545 is a `hidden beast` number, since 1 + 6 + 17 + 97 + 545 = 666.

161797545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161797545 - 2⁷ = 161797417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161797545.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15661 + ... + 23850.

It is an arithmetic number, because the mean of its divisors is an integer number (7191184).

Almost surely, 2^161797545 is an apocalyptic number.

161797545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161797545 is an abundant number, since it is smaller than the sum of its proper divisors (183379287).

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

161797545 is a wasteful number, since it uses less digits than its factorization.

161797545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39542 (or 39539 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 161797545 is about 12719.9663914650. The cubic root of 161797545 is about 544.9089935857.

The spelling of 161797545 in words is "one hundred sixty-one million, seven hundred ninety-seven thousand, five hundred forty-five".