169173521442 has 12 divisors (see below), whose sum is σ = 366542629830. Its totient is φ = 56391173808.

The previous prime is 169173521441. The next prime is 169173521449. The reversal of 169173521442 is 244125371961.

169173521442 is a `hidden beast` number, since 1 + 6 + 91 + 73 + 52 + 1 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 147901007241 + 21272514201 = 384579^2 + 145851^2 .

It is not an unprimeable number, because it can be changed into a prime (169173521441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4699264467 + ... + 4699264502.

Almost surely, 2^169173521442 is an apocalyptic number.

169173521442 is an abundant number, since it is smaller than the sum of its proper divisors (197369108388).

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

169173521442 is a wasteful number, since it uses less digits than its factorization.

169173521442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9398528977 (or 9398528974 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 169173521442 in words is "one hundred sixty-nine billion, one hundred seventy-three million, five hundred twenty-one thousand, four hundred forty-two".