125005664571 has 4 divisors (see below), whose sum is σ = 166674219432. Its totient is φ = 83337109712.

The previous prime is 125005664513. The next prime is 125005664591. The reversal of 125005664571 is 175466500521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125005664571 - 2¹⁹ = 125005140283 is a prime.

It is a super-2 number, since 2×125005664571² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125005664591) 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, 20834277426 + ... + 20834277431.

It is an arithmetic number, because the mean of its divisors is an integer number (41668554858).

Almost surely, 2^125005664571 is an apocalyptic number.

125005664571 is a deficient number, since it is larger than the sum of its proper divisors (41668554861).

125005664571 is an equidigital number, since it uses as much as digits as its factorization.

125005664571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41668554860.

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 125005664571 in words is "one hundred twenty-five billion, five million, six hundred sixty-four thousand, five hundred seventy-one".