1861622850487 has 4 divisors (see below), whose sum is σ = 1863199162296. Its totient is φ = 1860046538680.

The previous prime is 1861622850467. The next prime is 1861622850491. The reversal of 1861622850487 is 7840582261681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1861622850487 - 2²³ = 1861614461879 is a prime.

It is a super-2 number, since 2×1861622850487² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861622850467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 788154133 + ... + 788156494.

It is an arithmetic number, because the mean of its divisors is an integer number (465799790574).

Almost surely, 2^{1861622850487} is an apocalyptic number.

1861622850487 is a deficient number, since it is larger than the sum of its proper divisors (1576311809).

1861622850487 is a wasteful number, since it uses less digits than its factorization.

1861622850487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576311808.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 1861622850487 in words is "one trillion, eight hundred sixty-one billion, six hundred twenty-two million, eight hundred fifty thousand, four hundred eighty-seven".