665161534 has 4 divisors (see below), whose sum is σ = 997742304. Its totient is φ = 332580766.

The previous prime is 665161463. The next prime is 665161547. The reversal of 665161534 is 435161566.

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

It is a junction number, because it is equal to n+sod(n) for n = 665161493 and 665161502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166290382 + ... + 166290385.

It is an arithmetic number, because the mean of its divisors is an integer number (249435576).

Almost surely, 2^665161534 is an apocalyptic number.

665161534 is a deficient number, since it is larger than the sum of its proper divisors (332580770).

665161534 is a wasteful number, since it uses less digits than its factorization.

665161534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332580769.

The product of its digits is 64800, while the sum is 37.

The square root of 665161534 is about 25790.7257362022. The cubic root of 665161534 is about 872.9225421100.

The spelling of 665161534 in words is "six hundred sixty-five million, one hundred sixty-one thousand, five hundred thirty-four".