1866113749 has 12 divisors (see below), whose sum is σ = 1986530688. Its totient is φ = 1752632000.

The previous prime is 1866113737. The next prime is 1866113761. The reversal of 1866113749 is 9473116681.

It is an interprime number because it is at equal distance from previous prime (1866113737) and next prime (1866113761).

It is not a de Polignac number, because 1866113749 - 2⁷ = 1866113621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866113699 and 1866113708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866113449) 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, 135324 + ... + 148474.

It is an arithmetic number, because the mean of its divisors is an integer number (165544224).

Almost surely, 2^1866113749 is an apocalyptic number.

It is an amenable number.

1866113749 is a deficient number, since it is larger than the sum of its proper divisors (120416939).

1866113749 is a wasteful number, since it uses less digits than its factorization.

1866113749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13676 (or 13659 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 1866113749 is about 43198.5387368601. The cubic root of 1866113749 is about 1231.1549178416.

The spelling of 1866113749 in words is "one billion, eight hundred sixty-six million, one hundred thirteen thousand, seven hundred forty-nine".