1861486458855 has 32 divisors (see below), whose sum is σ = 2982339060480. Its totient is φ = 991472993280.

The previous prime is 1861486458847. The next prime is 1861486458857. The reversal of 1861486458855 is 5588546841681.

It is not a de Polignac number, because 1861486458855 - 2³ = 1861486458847 is a prime.

It is a super-2 number, since 2×1861486458855² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1861486458855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861486458857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88585300 + ... + 88606310.

It is an arithmetic number, because the mean of its divisors is an integer number (93198095640).

Almost surely, 2^{1861486458855} is an apocalyptic number.

1861486458855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1861486458855 is a deficient number, since it is larger than the sum of its proper divisors (1120852601625).

1861486458855 is a wasteful number, since it uses less digits than its factorization.

1861486458855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28591.

The product of its digits is 294912000, while the sum is 69.

The spelling of 1861486458855 in words is "one trillion, eight hundred sixty-one billion, four hundred eighty-six million, four hundred fifty-eight thousand, eight hundred fifty-five".