42561200257 has 4 divisors (see below), whose sum is σ = 42561672496. Its totient is φ = 42560728020.

The previous prime is 42561200251. The next prime is 42561200261. The reversal of 42561200257 is 75200216524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42561200257 is a prime.

It is a super-2 number, since 2×42561200257² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42561200251) 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, 54219 + ... + 296752.

It is an arithmetic number, because the mean of its divisors is an integer number (10640418124).

Almost surely, 2^42561200257 is an apocalyptic number.

It is an amenable number.

42561200257 is a deficient number, since it is larger than the sum of its proper divisors (472239).

42561200257 is a wasteful number, since it uses less digits than its factorization.

42561200257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472238.

The product of its (nonzero) digits is 33600, while the sum is 34.

The spelling of 42561200257 in words is "forty-two billion, five hundred sixty-one million, two hundred thousand, two hundred fifty-seven".