1381644750726 has 24 divisors (see below), whose sum is σ = 2995652701080. Its totient is φ = 460226854176.

The previous prime is 1381644750721. The next prime is 1381644750743. The reversal of 1381644750726 is 6270574461831.

1381644750726 is a `hidden beast` number, since 1 + 3 + 8 + 164 + 475 + 0 + 7 + 2 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381644750721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26756496 + ... + 26808083.

It is an arithmetic number, because the mean of its divisors is an integer number (124818862545).

Almost surely, 2^{1381644750726} is an apocalyptic number.

1381644750726 is an abundant number, since it is smaller than the sum of its proper divisors (1614007950354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381644750726 is a wasteful number, since it uses less digits than its factorization.

1381644750726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53566020 (or 53566017 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 1381644750726 in words is "one trillion, three hundred eighty-one billion, six hundred forty-four million, seven hundred fifty thousand, seven hundred twenty-six".