64191287197 has 8 divisors (see below), whose sum is σ = 64663444800. Its totient is φ = 63720391584.

The previous prime is 64191287081. The next prime is 64191287201. The reversal of 64191287197 is 79178219146.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64191287197 - 2¹¹ = 64191285149 is a prime.

It is a super-2 number, since 2×64191287197² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64191257197) 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, 213273 + ... + 416974.

It is an arithmetic number, because the mean of its divisors is an integer number (8082930600).

Almost surely, 2^64191287197 is an apocalyptic number.

It is an amenable number.

64191287197 is a deficient number, since it is larger than the sum of its proper divisors (472157603).

64191287197 is a wasteful number, since it uses less digits than its factorization.

64191287197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630995.

The product of its digits is 1524096, while the sum is 55.

The spelling of 64191287197 in words is "sixty-four billion, one hundred ninety-one million, two hundred eighty-seven thousand, one hundred ninety-seven".