161635620 has 24 divisors (see below), whose sum is σ = 452579904. Its totient is φ = 43102816.

The previous prime is 161635613. The next prime is 161635627. The reversal of 161635620 is 26536161.

It is an interprime number because it is at equal distance from previous prime (161635613) and next prime (161635627).

It is a super-2 number, since 2×161635620² = 52252147305568800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161635627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346904 + ... + 1347023.

It is an arithmetic number, because the mean of its divisors is an integer number (18857496).

Almost surely, 2^161635620 is an apocalyptic number.

161635620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161635620 is an abundant number, since it is smaller than the sum of its proper divisors (290944284).

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

161635620 is a wasteful number, since it uses less digits than its factorization.

161635620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693939 (or 2693937 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 161635620 is about 12713.5998049333. The cubic root of 161635620 is about 544.7271534971.

The spelling of 161635620 in words is "one hundred sixty-one million, six hundred thirty-five thousand, six hundred twenty".