163725457442 has 4 divisors (see below), whose sum is σ = 245588186166. Its totient is φ = 81862728720.

The previous prime is 163725457421. The next prime is 163725457463. The reversal of 163725457442 is 244754527361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244754527361 = 61 ⋅4012369301.

It is an interprime number because it is at equal distance from previous prime (163725457421) and next prime (163725457463).

It can be written as a sum of positive squares in only one way, i.e., 140760782761 + 22964674681 = 375181^2 + 151541^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40931364359 + ... + 40931364362.

Almost surely, 2^163725457442 is an apocalyptic number.

163725457442 is a deficient number, since it is larger than the sum of its proper divisors (81862728724).

163725457442 is an equidigital number, since it uses as much as digits as its factorization.

163725457442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81862728723.

The product of its digits is 5644800, while the sum is 50.

The spelling of 163725457442 in words is "one hundred sixty-three billion, seven hundred twenty-five million, four hundred fifty-seven thousand, four hundred forty-two".