161692650 has 108 divisors (see below), whose sum is σ = 505407942. Its totient is φ = 36953280.

The previous prime is 161692637. The next prime is 161692681. The reversal of 161692650 is 56296161.

161692650 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 64689849 + 97002801 = 8043^2 + 9849^2 .

It is a super-2 number, since 2×161692650² = 52289026128045000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 18384 + ... + 25716.

Almost surely, 2^161692650 is an apocalyptic number.

161692650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161692650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252703971).

161692650 is an abundant number, since it is smaller than the sum of its proper divisors (343715292).

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

161692650 is a wasteful number, since it uses less digits than its factorization.

161692650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365 (or 7350 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 161692650 is about 12715.8424809369. The cubic root of 161692650 is about 544.7912114413.

The spelling of 161692650 in words is "one hundred sixty-one million, six hundred ninety-two thousand, six hundred fifty".