161111040 has 176 divisors, whose sum is σ = 546499872. Its totient is φ = 40370176.

The previous prime is 161111029. The next prime is 161111053. The reversal of 161111040 is 40111161.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260812 + ... + 261428.

Almost surely, 2^161111040 is an apocalyptic number.

161111040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161111040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273249936).

161111040 is an abundant number, since it is smaller than the sum of its proper divisors (385388832).

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

161111040 is a wasteful number, since it uses less digits than its factorization.

161111040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 161111040 is about 12692.9523752356. The cubic root of 161111040 is about 544.1372202862.

The spelling of 161111040 in words is "one hundred sixty-one million, one hundred eleven thousand, forty".