65125881 has 6 divisors (see below), whose sum is σ = 94070730. Its totient is φ = 43417248.

The previous prime is 65125877. The next prime is 65125891. The reversal of 65125881 is 18852156.

65125881 is a `hidden beast` number, since 65 + 12 + 588 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47485881 + 17640000 = 6891^2 + 4200^2 .

It is not a de Polignac number, because 65125881 - 2² = 65125877 is a prime.

It is a super-2 number, since 2×65125881² = 8482760752052322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65125891) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3618096 + ... + 3618113.

It is an arithmetic number, because the mean of its divisors is an integer number (15678455).

Almost surely, 2^65125881 is an apocalyptic number.

It is an amenable number.

65125881 is a deficient number, since it is larger than the sum of its proper divisors (28944849).

65125881 is a wasteful number, since it uses less digits than its factorization.

65125881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236215 (or 7236212 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 65125881 is about 8070.0607804403. The cubic root of 65125881 is about 402.3319638586.

The spelling of 65125881 in words is "sixty-five million, one hundred twenty-five thousand, eight hundred eighty-one".