381666157812789 has 32 divisors (see below), whose sum is σ = 514509299548800. Its totient is φ = 251647707128832.

The previous prime is 381666157812697. The next prime is 381666157812799. The reversal of 381666157812789 is 987218751666183.

It is not a de Polignac number, because 381666157812789 - 2¹³ = 381666157804597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381666157812799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 633488439 + ... + 634090635.

It is an arithmetic number, because the mean of its divisors is an integer number (16078415610900).

Almost surely, 2^{381666157812789} is an apocalyptic number.

It is an amenable number.

381666157812789 is a deficient number, since it is larger than the sum of its proper divisors (132843141736011).

381666157812789 is a wasteful number, since it uses less digits than its factorization.

381666157812789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608069.

The product of its digits is 1463132160, while the sum is 78.

The spelling of 381666157812789 in words is "three hundred eighty-one trillion, six hundred sixty-six billion, one hundred fifty-seven million, eight hundred twelve thousand, seven hundred eighty-nine".