163642745 has 8 divisors (see below), whose sum is σ = 224424384. Its totient is φ = 112212144.

The previous prime is 163642741. The next prime is 163642751. The reversal of 163642745 is 547246361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163642745 - 2² = 163642741 is a prime.

It is a super-2 number, since 2×163642745² = 53557895982270050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163642699 and 163642708.

It is not an unprimeable number, because it can be changed into a prime (163642741) 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, 2337719 + ... + 2337788.

It is an arithmetic number, because the mean of its divisors is an integer number (28053048).

Almost surely, 2^163642745 is an apocalyptic number.

It is an amenable number.

163642745 is a deficient number, since it is larger than the sum of its proper divisors (60781639).

163642745 is an equidigital number, since it uses as much as digits as its factorization.

163642745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4675519.

The product of its digits is 120960, while the sum is 38.

The square root of 163642745 is about 12792.2924059763. The cubic root of 163642745 is about 546.9726175456.

The spelling of 163642745 in words is "one hundred sixty-three million, six hundred forty-two thousand, seven hundred forty-five".