1387810055506 has 72 divisors (see below), whose sum is σ = 2602887584220. Its totient is φ = 551430899712.

The previous prime is 1387810055453. The next prime is 1387810055507. The reversal of 1387810055506 is 6055500187831.

It can be written as a sum of positive squares in 2 ways, for example, as 1386880720281 + 929335225 = 1177659^2 + 30485^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 1387810055506.

It is not an unprimeable number, because it can be changed into a prime (1387810055507) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7385890 + ... + 7571458.

Almost surely, 2^{1387810055506} is an apocalyptic number.

1387810055506 is a deficient number, since it is larger than the sum of its proper divisors (1215077528714).

1387810055506 is a wasteful number, since it uses less digits than its factorization.

1387810055506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185736 (or 185662 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 49.

The spelling of 1387810055506 in words is "one trillion, three hundred eighty-seven billion, eight hundred ten million, fifty-five thousand, five hundred six".