163137640 has 16 divisors (see below), whose sum is σ = 367059780. Its totient is φ = 65255040.

The previous prime is 163137599. The next prime is 163137649. The reversal of 163137640 is 46731361.

It can be written as a sum of positive squares in 2 ways, for example, as 161442436 + 1695204 = 12706^2 + 1302^2 .

It is a super-2 number, since 2×163137640² = 53227779169539200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163137649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2039181 + ... + 2039260.

Almost surely, 2^163137640 is an apocalyptic number.

163137640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163137640 is an abundant number, since it is smaller than the sum of its proper divisors (203922140).

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

163137640 is a wasteful number, since it uses less digits than its factorization.

163137640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078452 (or 4078448 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 163137640 is about 12772.5345957645. The cubic root of 163137640 is about 546.4092697291.

The spelling of 163137640 in words is "one hundred sixty-three million, one hundred thirty-seven thousand, six hundred forty".