1185711855123 has 6 divisors (see below), whose sum is σ = 1580951654884. Its totient is φ = 790473312724.

The previous prime is 1185711855113. The next prime is 1185711855127. The reversal of 1185711855123 is 3215581175811.

It is not a de Polignac number, because 1185711855123 - 2⁸ = 1185711854867 is a prime.

It is a super-2 number, since 2×1185711855123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1185711855127) 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, 1571698 + ... + 2200376.

Almost surely, 2^{1185711855123} is an apocalyptic number.

1185711855123 is a deficient number, since it is larger than the sum of its proper divisors (395239799761).

1185711855123 is an frugal number, since it uses more digits than its factorization.

1185711855123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257361 (or 628682 counting only the distinct ones).

The product of its digits is 336000, while the sum is 48.

Multiplying 1185711855123 by its sum of digits (48), we get a square (56914169045904 = 7544148²).

The spelling of 1185711855123 in words is "one trillion, one hundred eighty-five billion, seven hundred eleven million, eight hundred fifty-five thousand, one hundred twenty-three".