657200000042 has 4 divisors (see below), whose sum is σ = 985800000066. Its totient is φ = 328600000020.

The previous prime is 657199999999. The next prime is 657200000123. The reversal of 657200000042 is 240000002756.

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

It can be written as a sum of positive squares in only one way, i.e., 639585667081 + 17614332961 = 799741^2 + 132719^2 .

It is a junction number, because it is equal to n+sod(n) for n = 657199999957 and 657200000020.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164300000009 + ... + 164300000012.

Almost surely, 2^657200000042 is an apocalyptic number.

657200000042 is a deficient number, since it is larger than the sum of its proper divisors (328600000024).

657200000042 is a wasteful number, since it uses less digits than its factorization.

657200000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328600000023.

The product of its (nonzero) digits is 3360, while the sum is 26.

Adding to 657200000042 its reverse (240000002756), we get a palindrome (897200002798).

The spelling of 657200000042 in words is "six hundred fifty-seven billion, two hundred million, forty-two", and thus it is an aban number.