126685581399 has 24 divisors (see below), whose sum is σ = 197581063680. Its totient is φ = 77756778432.

The previous prime is 126685581377. The next prime is 126685581409. The reversal of 126685581399 is 993185586621.

126685581399 is a `hidden beast` number, since 1 + 2 + 6 + 68 + 558 + 13 + 9 + 9 = 666.

It is not a de Polignac number, because 126685581399 - 2²⁹ = 126148710487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126685581329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1368744 + ... + 1458365.

It is an arithmetic number, because the mean of its divisors is an integer number (8232544320).

Almost surely, 2^126685581399 is an apocalyptic number.

126685581399 is a deficient number, since it is larger than the sum of its proper divisors (70895482281).

126685581399 is a wasteful number, since it uses less digits than its factorization.

126685581399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827511 (or 2827508 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 63.

The spelling of 126685581399 in words is "one hundred twenty-six billion, six hundred eighty-five million, five hundred eighty-one thousand, three hundred ninety-nine".