665126525 has 12 divisors (see below), whose sum is σ = 942579552. Its totient is φ = 456086640.

The previous prime is 665126507. The next prime is 665126531. The reversal of 665126525 is 525621566.

It is a happy number.

It is not a de Polignac number, because 665126525 - 2¹⁴ = 665110141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1900187 + ... + 1900536.

It is an arithmetic number, because the mean of its divisors is an integer number (78548296).

Almost surely, 2^665126525 is an apocalyptic number.

It is an amenable number.

665126525 is a deficient number, since it is larger than the sum of its proper divisors (277453027).

665126525 is a wasteful number, since it uses less digits than its factorization.

665126525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800740 (or 3800735 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 665126525 is about 25790.0470143038. The cubic root of 665126525 is about 872.9072271928.

It can be divided in two parts, 66512 and 6525, that added together give a palindrome (73037).

The spelling of 665126525 in words is "six hundred sixty-five million, one hundred twenty-six thousand, five hundred twenty-five".