425123661 has 4 divisors (see below), whose sum is σ = 566831552. Its totient is φ = 283415772.

The previous prime is 425123659. The next prime is 425123669. The reversal of 425123661 is 166321524.

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 not a de Polignac number, because 425123661 - 2¹ = 425123659 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 (425123669) 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, 70853941 + ... + 70853946.

It is an arithmetic number, because the mean of its divisors is an integer number (141707888).

Almost surely, 2^425123661 is an apocalyptic number.

It is an amenable number.

425123661 is a deficient number, since it is larger than the sum of its proper divisors (141707891).

425123661 is a wasteful number, since it uses less digits than its factorization.

425123661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141707890.

The product of its digits is 8640, while the sum is 30.

The square root of 425123661 is about 20618.5271297443. The cubic root of 425123661 is about 751.9202119634.

The spelling of 425123661 in words is "four hundred twenty-five million, one hundred twenty-three thousand, six hundred sixty-one".