425205257721 has 4 divisors (see below), whose sum is σ = 566940343632. Its totient is φ = 283470171812.

The previous prime is 425205257717. The next prime is 425205257753. The reversal of 425205257721 is 127752502524.

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.

It is a cyclic number.

It is not a de Polignac number, because 425205257721 - 2² = 425205257717 is a prime.

It is a super-2 number, since 2×425205257721² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (425205257761) 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, 70867542951 + ... + 70867542956.

It is an arithmetic number, because the mean of its divisors is an integer number (141735085908).

Almost surely, 2^425205257721 is an apocalyptic number.

It is an amenable number.

425205257721 is a deficient number, since it is larger than the sum of its proper divisors (141735085911).

425205257721 is a wasteful number, since it uses less digits than its factorization.

425205257721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141735085910.

The product of its (nonzero) digits is 392000, while the sum is 42.

The spelling of 425205257721 in words is "four hundred twenty-five billion, two hundred five million, two hundred fifty-seven thousand, seven hundred twenty-one".