65198874949 has 4 divisors (see below), whose sum is σ = 70214173036. Its totient is φ = 60183576864.

The previous prime is 65198874947. The next prime is 65198874971. The reversal of 65198874949 is 94947889156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43464744324 + 21734130625 = 208482^2 + 147425^2 .

It is a cyclic number.

It is not a de Polignac number, because 65198874949 - 2¹ = 65198874947 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 (65198874947) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2507649024 + ... + 2507649049.

It is an arithmetic number, because the mean of its divisors is an integer number (17553543259).

Almost surely, 2^65198874949 is an apocalyptic number.

It is an amenable number.

65198874949 is a deficient number, since it is larger than the sum of its proper divisors (5015298087).

65198874949 is a wasteful number, since it uses less digits than its factorization.

65198874949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015298086.

The product of its digits is 156764160, while the sum is 70.

The spelling of 65198874949 in words is "sixty-five billion, one hundred ninety-eight million, eight hundred seventy-four thousand, nine hundred forty-nine".