425664571 has 8 divisors (see below), whose sum is σ = 442926144. Its totient is φ = 408744960.

The previous prime is 425664529. The next prime is 425664593. The reversal of 425664571 is 175466524.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 425664571 - 2²⁵ = 392110139 is a prime.

It is a super-2 number, since 2×425664571² = 362380654009228082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425664521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82950 + ... + 87931.

It is an arithmetic number, because the mean of its divisors is an integer number (55365768).

Almost surely, 2^425664571 is an apocalyptic number.

425664571 is a deficient number, since it is larger than the sum of its proper divisors (17261573).

425664571 is a wasteful number, since it uses less digits than its factorization.

425664571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170981.

The product of its digits is 201600, while the sum is 40.

The square root of 425664571 is about 20631.6400462978. The cubic root of 425664571 is about 752.2389810045.

The spelling of 425664571 in words is "four hundred twenty-five million, six hundred sixty-four thousand, five hundred seventy-one".