63974647815 has 32 divisors (see below), whose sum is σ = 110309283840. Its totient is φ = 31473484416.

The previous prime is 63974647811. The next prime is 63974647823. The reversal of 63974647815 is 51874647936.

It is not a de Polignac number, because 63974647815 - 2² = 63974647811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63974647811) 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 31 ways as a sum of consecutive naturals, for example, 172074 + ... + 396936.

It is an arithmetic number, because the mean of its divisors is an integer number (3447165120).

Almost surely, 2^63974647815 is an apocalyptic number.

63974647815 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

63974647815 is a deficient number, since it is larger than the sum of its proper divisors (46334636025).

63974647815 is a wasteful number, since it uses less digits than its factorization.

63974647815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226343.

The product of its digits is 30481920, while the sum is 60.

The spelling of 63974647815 in words is "sixty-three billion, nine hundred seventy-four million, six hundred forty-seven thousand, eight hundred fifteen".