242157641573 has 4 divisors (see below), whose sum is σ = 242169965388. Its totient is φ = 242145317760.

The previous prime is 242157641521. The next prime is 242157641597. The reversal of 242157641573 is 375146751242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 238907843524 + 3249798049 = 488782^2 + 57007^2 .

It is a cyclic number.

It is not a de Polignac number, because 242157641573 - 2⁸ = 242157641317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242157641503) 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, 6132386 + ... + 6171747.

It is an arithmetic number, because the mean of its divisors is an integer number (60542491347).

Almost surely, 2^242157641573 is an apocalyptic number.

It is an amenable number.

242157641573 is a deficient number, since it is larger than the sum of its proper divisors (12323815).

242157641573 is a wasteful number, since it uses less digits than its factorization.

242157641573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12323814.

The product of its digits is 1411200, while the sum is 47.

The spelling of 242157641573 in words is "two hundred forty-two billion, one hundred fifty-seven million, six hundred forty-one thousand, five hundred seventy-three".