1866081687051 has 12 divisors (see below), whose sum is σ = 2643077638712. Its totient is φ = 1170874783488.

The previous prime is 1866081687047. The next prime is 1866081687053. The reversal of 1866081687051 is 1507861806681.

It is not a de Polignac number, because 1866081687051 - 2² = 1866081687047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866081686982 and 1866081687000.

It is not an unprimeable number, because it can be changed into a prime (1866081687053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076170810 + ... + 1076172543.

Almost surely, 2^{1866081687051} is an apocalyptic number.

1866081687051 is a deficient number, since it is larger than the sum of its proper divisors (776995951661).

1866081687051 is a wasteful number, since it uses less digits than its factorization.

1866081687051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152343390 (or 2152343373 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 57.

The spelling of 1866081687051 in words is "one trillion, eight hundred sixty-six billion, eighty-one million, six hundred eighty-seven thousand, fifty-one".