381787764947 has 4 divisors (see below), whose sum is σ = 394952860320. Its totient is φ = 368622669576.

The previous prime is 381787764901. The next prime is 381787764949. The reversal of 381787764947 is 749467787183.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381787764947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381787764949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6582547643 + ... + 6582547700.

It is an arithmetic number, because the mean of its divisors is an integer number (98738215080).

Almost surely, 2^381787764947 is an apocalyptic number.

381787764947 is a deficient number, since it is larger than the sum of its proper divisors (13165095373).

381787764947 is a wasteful number, since it uses less digits than its factorization.

381787764947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13165095372.

The product of its digits is 398297088, while the sum is 71.

The spelling of 381787764947 in words is "three hundred eighty-one billion, seven hundred eighty-seven million, seven hundred sixty-four thousand, nine hundred forty-seven".