63145863378865 has 4 divisors (see below), whose sum is σ = 75775036054644. Its totient is φ = 50516690703088.

The previous prime is 63145863378803. The next prime is 63145863378889. The reversal of 63145863378865 is 56887336854136.

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 38224691142544 + 24921172236321 = 6182612^2 + 4992111^2 .

It is a cyclic number.

It is not a de Polignac number, because 63145863378865 - 2¹³ = 63145863370673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6314586337882 + ... + 6314586337891.

It is an arithmetic number, because the mean of its divisors is an integer number (18943759013661).

Almost surely, 2^{63145863378865} is an apocalyptic number.

It is an amenable number.

63145863378865 is a deficient number, since it is larger than the sum of its proper divisors (12629172675779).

63145863378865 is a wasteful number, since it uses less digits than its factorization.

63145863378865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12629172675778.

The product of its digits is 2090188800, while the sum is 73.

The spelling of 63145863378865 in words is "sixty-three trillion, one hundred forty-five billion, eight hundred sixty-three million, three hundred seventy-eight thousand, eight hundred sixty-five".