1851398356922 has 16 divisors (see below), whose sum is σ = 2780557289640. Its totient is φ = 924546266112.

The previous prime is 1851398356897. The next prime is 1851398357023. The reversal of 1851398356922 is 2296538931581.

It is a happy number.

It is a Cunningham number, because it is equal to 1360661²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1848482248921 + 2916108001 = 1359589^2 + 54001^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11313878 + ... + 11476350.

Almost surely, 2^{1851398356922} is an apocalyptic number.

1851398356922 is a deficient number, since it is larger than the sum of its proper divisors (929158932718).

1851398356922 is a wasteful number, since it uses less digits than its factorization.

1851398356922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169537.

The product of its digits is 27993600, while the sum is 62.

The spelling of 1851398356922 in words is "one trillion, eight hundred fifty-one billion, three hundred ninety-eight million, three hundred fifty-six thousand, nine hundred twenty-two".