1861728610911 has 64 divisors (see below), whose sum is σ = 2733481699200. Its totient is φ = 1120173981696.

The previous prime is 1861728610879. The next prime is 1861728610939. The reversal of 1861728610911 is 1190168271681.

It is not a de Polignac number, because 1861728610911 - 2⁵ = 1861728610879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861728610981) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 763941585 + ... + 763944021.

It is an arithmetic number, because the mean of its divisors is an integer number (42710651550).

Almost surely, 2^{1861728610911} is an apocalyptic number.

1861728610911 is a deficient number, since it is larger than the sum of its proper divisors (871753088289).

1861728610911 is a wasteful number, since it uses less digits than its factorization.

1861728610911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908.

The product of its (nonzero) digits is 290304, while the sum is 51.

The spelling of 1861728610911 in words is "one trillion, eight hundred sixty-one billion, seven hundred twenty-eight million, six hundred ten thousand, nine hundred eleven".