665170551652 has 6 divisors (see below), whose sum is σ = 1164048465398. Its totient is φ = 332585275824.

The previous prime is 665170551613. The next prime is 665170551697. The reversal of 665170551652 is 256155071566.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 608534167396 + 56636384256 = 780086^2 + 237984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 665170551596 and 665170551605.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 83146318953 + ... + 83146318960.

Almost surely, 2^665170551652 is an apocalyptic number.

It is an amenable number.

665170551652 is a deficient number, since it is larger than the sum of its proper divisors (498877913746).

665170551652 is a wasteful number, since it uses less digits than its factorization.

665170551652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166292637917 (or 166292637915 counting only the distinct ones).

The product of its (nonzero) digits is 1890000, while the sum is 49.

The spelling of 665170551652 in words is "six hundred sixty-five billion, one hundred seventy million, five hundred fifty-one thousand, six hundred fifty-two".