1187804666257 has 16 divisors (see below), whose sum is σ = 1377475896384. Its totient is φ = 1012254400000.

The previous prime is 1187804666249. The next prime is 1187804666333. The reversal of 1187804666257 is 7526664087811.

It is a cyclic number.

It is not a de Polignac number, because 1187804666257 - 2³ = 1187804666249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1187804666195 and 1187804666204.

It is not an unprimeable number, because it can be changed into a prime (1187804666227) 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 15 ways as a sum of consecutive naturals, for example, 12606244 + ... + 12700117.

It is an arithmetic number, because the mean of its divisors is an integer number (86092243524).

Almost surely, 2^{1187804666257} is an apocalyptic number.

1187804666257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1187804666257 is a deficient number, since it is larger than the sum of its proper divisors (189671230127).

1187804666257 is a wasteful number, since it uses less digits than its factorization.

1187804666257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25306640.

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 1187804666257 in words is "one trillion, one hundred eighty-seven billion, eight hundred four million, six hundred sixty-six thousand, two hundred fifty-seven".