13781507877 has 6 divisors (see below), whose sum is σ = 19906622502. Its totient is φ = 9187671912.

The previous prime is 13781507851. The next prime is 13781507917. The reversal of 13781507877 is 77870518731.

It can be written as a sum of positive squares in only one way, i.e., 7714811556 + 6066696321 = 87834^2 + 77889^2 .

It is not a de Polignac number, because 13781507877 - 2⁶ = 13781507813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781507477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 765639318 + ... + 765639335.

It is an arithmetic number, because the mean of its divisors is an integer number (3317770417).

Almost surely, 2^13781507877 is an apocalyptic number.

It is an amenable number.

13781507877 is a deficient number, since it is larger than the sum of its proper divisors (6125114625).

13781507877 is a wasteful number, since it uses less digits than its factorization.

13781507877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531278659 (or 1531278656 counting only the distinct ones).

The product of its (nonzero) digits is 2304960, while the sum is 54.

The spelling of 13781507877 in words is "thirteen billion, seven hundred eighty-one million, five hundred seven thousand, eight hundred seventy-seven".