1851992961225 has 96 divisors (see below), whose sum is σ = 3541948300800. Its totient is φ = 843888768000.

The previous prime is 1851992961199. The next prime is 1851992961257. The reversal of 1851992961225 is 5221692991581.

It is not a de Polignac number, because 1851992961225 - 2⁸ = 1851992960969 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9595726 + ... + 9786824.

It is an arithmetic number, because the mean of its divisors is an integer number (36895294800).

Almost surely, 2^{1851992961225} is an apocalyptic number.

1851992961225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1851992961225 is a deficient number, since it is larger than the sum of its proper divisors (1689955339575).

1851992961225 is a wasteful number, since it uses less digits than its factorization.

1851992961225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191831 (or 191826 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 60.

The spelling of 1851992961225 in words is "one trillion, eight hundred fifty-one billion, nine hundred ninety-two million, nine hundred sixty-one thousand, two hundred twenty-five".