665199850949 has 8 divisors (see below), whose sum is σ = 741399215040. Its totient is φ = 593119371456.

The previous prime is 665199850937. The next prime is 665199850951. The reversal of 665199850949 is 949058991566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665199850949 - 2¹² = 665199846853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665199850349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1029720809 + ... + 1029721454.

It is an arithmetic number, because the mean of its divisors is an integer number (92674901880).

Almost surely, 2^665199850949 is an apocalyptic number.

It is an amenable number.

665199850949 is a deficient number, since it is larger than the sum of its proper divisors (76199364091).

665199850949 is a wasteful number, since it uses less digits than its factorization.

665199850949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059442299.

The product of its (nonzero) digits is 188956800, while the sum is 71.

The spelling of 665199850949 in words is "six hundred sixty-five billion, one hundred ninety-nine million, eight hundred fifty thousand, nine hundred forty-nine".