64273037197 has 4 divisors (see below), whose sum is σ = 64274602140. Its totient is φ = 64271472256.

The previous prime is 64273037161. The next prime is 64273037201. The reversal of 64273037197 is 79173037246.

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 18519399396 + 45753637801 = 136086^2 + 213901^2 .

It is a cyclic number.

It is not a de Polignac number, because 64273037197 - 2¹¹ = 64273035149 is a prime.

It is a super-3 number, since 3×64273037197³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64273037197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64273037117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719158 + ... + 803575.

It is an arithmetic number, because the mean of its divisors is an integer number (16068650535).

Almost surely, 2^64273037197 is an apocalyptic number.

It is an amenable number.

64273037197 is a deficient number, since it is larger than the sum of its proper divisors (1564943).

64273037197 is a wasteful number, since it uses less digits than its factorization.

64273037197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564942.

The product of its (nonzero) digits is 1333584, while the sum is 49.

Adding to 64273037197 its sum of digits (49), we get a palindrome (64273037246).

The spelling of 64273037197 in words is "sixty-four billion, two hundred seventy-three million, thirty-seven thousand, one hundred ninety-seven".