425557661 has 16 divisors (see below), whose sum is σ = 454329216. Its totient is φ = 397748736.

The previous prime is 425557637. The next prime is 425557667. The reversal of 425557661 is 166755524.

It is a cyclic number.

It is not a de Polignac number, because 425557661 - 2⁶ = 425557597 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 (425557667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188606 + ... + 190848.

It is an arithmetic number, because the mean of its divisors is an integer number (28395576).

Almost surely, 2^425557661 is an apocalyptic number.

It is an amenable number.

425557661 is a deficient number, since it is larger than the sum of its proper divisors (28771555).

425557661 is a wasteful number, since it uses less digits than its factorization.

425557661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452.

The product of its digits is 252000, while the sum is 41.

The square root of 425557661 is about 20629.0489601436. The cubic root of 425557661 is about 752.1759982329.

It can be divided in two parts, 4255 and 57661, that added together give a palindrome (61916).

The spelling of 425557661 in words is "four hundred twenty-five million, five hundred fifty-seven thousand, six hundred sixty-one".