667863786395 has 16 divisors (see below), whose sum is σ = 863107089600. Its totient is φ = 493179387264.

The previous prime is 667863786391. The next prime is 667863786397. The reversal of 667863786395 is 593687368766.

It is a cyclic number.

It is not a de Polignac number, because 667863786395 - 2² = 667863786391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667863786391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3117002 + ... + 3324368.

It is an arithmetic number, because the mean of its divisors is an integer number (53944193100).

Almost surely, 2^667863786395 is an apocalyptic number.

667863786395 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

667863786395 is a deficient number, since it is larger than the sum of its proper divisors (195243303205).

667863786395 is a wasteful number, since it uses less digits than its factorization.

667863786395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256934.

The product of its digits is 1646023680, while the sum is 74.

The spelling of 667863786395 in words is "six hundred sixty-seven billion, eight hundred sixty-three million, seven hundred eighty-six thousand, three hundred ninety-five".