64678949197 has 8 divisors (see below), whose sum is σ = 66947478840. Its totient is φ = 62412967680.

The previous prime is 64678949171. The next prime is 64678949239. The reversal of 64678949197 is 79194987646.

It can be written as a sum of positive squares in 4 ways, for example, as 193933476 + 64485015721 = 13926^2 + 253939^2 .

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 64678949197 - 2²⁷ = 64544731469 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 (64678949117) 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 7 ways as a sum of consecutive naturals, for example, 585304 + ... + 686977.

It is an arithmetic number, because the mean of its divisors is an integer number (8368434855).

Almost surely, 2^64678949197 is an apocalyptic number.

It is an amenable number.

64678949197 is a deficient number, since it is larger than the sum of its proper divisors (2268529643).

64678949197 is a wasteful number, since it uses less digits than its factorization.

64678949197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274063.

The product of its digits is 164602368, while the sum is 70.

The spelling of 64678949197 in words is "sixty-four billion, six hundred seventy-eight million, nine hundred forty-nine thousand, one hundred ninety-seven".