1866509044 has 12 divisors (see below), whose sum is σ = 3266784864. Its totient is φ = 933141944.

The previous prime is 1866509011. The next prime is 1866509077. The reversal of 1866509044 is 4409056681.

It is an interprime number because it is at equal distance from previous prime (1866509011) and next prime (1866509077).

It is a super-2 number, since 2×1866509044² = 6967712022667587872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17319 + ... + 63505.

It is an arithmetic number, because the mean of its divisors is an integer number (272232072).

Almost surely, 2^1866509044 is an apocalyptic number.

It is an amenable number.

1866509044 is a deficient number, since it is larger than the sum of its proper divisors (1400275820).

1866509044 is a wasteful number, since it uses less digits than its factorization.

1866509044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56294 (or 56292 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1866509044 is about 43203.1138229642. The cubic root of 1866509044 is about 1231.2418427006.

The spelling of 1866509044 in words is "one billion, eight hundred sixty-six million, five hundred nine thousand, forty-four".