1826537815861 has 16 divisors (see below), whose sum is σ = 2121993091008. Its totient is φ = 1553779475200.

The previous prime is 1826537815853. The next prime is 1826537815873. The reversal of 1826537815861 is 1685187356281.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1826537815861 - 2³ = 1826537815853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1826537815861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1826537815831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28197655 + ... + 28262356.

It is an arithmetic number, because the mean of its divisors is an integer number (132624568188).

Almost surely, 2^{1826537815861} is an apocalyptic number.

1826537815861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1826537815861 is a deficient number, since it is larger than the sum of its proper divisors (295455275147).

1826537815861 is a wasteful number, since it uses less digits than its factorization.

1826537815861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56460212.

The product of its digits is 19353600, while the sum is 61.

The spelling of 1826537815861 in words is "one trillion, eight hundred twenty-six billion, five hundred thirty-seven million, eight hundred fifteen thousand, eight hundred sixty-one".