1853936418978 has 100 divisors (see below), whose sum is σ = 4846268660310. Its totient is φ = 529696008576.

The previous prime is 1853936418947. The next prime is 1853936418989. The reversal of 1853936418978 is 8798146393581.

1853936418978 is a `hidden beast` number, since 1 + 8 + 53 + 93 + 6 + 418 + 9 + 78 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1817473370769 + 36463048209 = 1348137^2 + 190953^2 .

It is a super-2 number, since 2×1853936418978² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 49 ways as a sum of consecutive naturals, for example, 1994223 + ... + 2772146.

Almost surely, 2^{1853936418978} is an apocalyptic number.

1853936418978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1853936418978 is an abundant number, since it is smaller than the sum of its proper divisors (2992332241332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1853936418978 is an frugal number, since it uses more digits than its factorization.

1853936418978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766411 (or 4766381 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 1853936418978 in words is "one trillion, eight hundred fifty-three billion, nine hundred thirty-six million, four hundred eighteen thousand, nine hundred seventy-eight".