65198421 has 6 divisors (see below), whose sum is σ = 94175510. Its totient is φ = 43465608.

The previous prime is 65198411. The next prime is 65198479. The reversal of 65198421 is 12489156.

It can be written as a sum of positive squares in only one way, i.e., 41139396 + 24059025 = 6414^2 + 4905^2 .

It is not a de Polignac number, because 65198421 - 2¹⁴ = 65182037 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 (65198411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3622126 + ... + 3622143.

Almost surely, 2^65198421 is an apocalyptic number.

It is an amenable number.

65198421 is a deficient number, since it is larger than the sum of its proper divisors (28977089).

65198421 is a wasteful number, since it uses less digits than its factorization.

65198421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7244275 (or 7244272 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 65198421 is about 8074.5539195673. The cubic root of 65198421 is about 402.4812866317.

The spelling of 65198421 in words is "sixty-five million, one hundred ninety-eight thousand, four hundred twenty-one".