161551746 has 24 divisors (see below), whose sum is σ = 362993904. Its totient is φ = 53850420.

The previous prime is 161551669. The next prime is 161551763. The reversal of 161551746 is 647155161.

It is a happy number.

161551746 is a `hidden beast` number, since 1 + 61 + 551 + 7 + 46 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 161551746.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165720 + ... + 166691.

It is an arithmetic number, because the mean of its divisors is an integer number (15124746).

Almost surely, 2^161551746 is an apocalyptic number.

161551746 is an abundant number, since it is smaller than the sum of its proper divisors (201442158).

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

161551746 is an equidigital number, since it uses as much as digits as its factorization.

161551746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332428 (or 332416 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 161551746 is about 12710.3007832230. The cubic root of 161551746 is about 544.6329161207.

It can be divided in two parts, 1615 and 51746, that added together give a square (53361 = 231²).

The spelling of 161551746 in words is "one hundred sixty-one million, five hundred fifty-one thousand, seven hundred forty-six".