40781851893 has 12 divisors (see below), whose sum is σ = 61088864928. Its totient is φ = 27187901100.

The previous prime is 40781851849. The next prime is 40781851963. The reversal of 40781851893 is 39815818704.

40781851893 is a `hidden beast` number, since 40 + 7 + 81 + 8 + 518 + 9 + 3 = 666.

It is not a de Polignac number, because 40781851893 - 2²⁰ = 40780803317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781851843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83913033 + ... + 83913518.

It is an arithmetic number, because the mean of its divisors is an integer number (5090738744).

Almost surely, 2^40781851893 is an apocalyptic number.

It is an amenable number.

40781851893 is a deficient number, since it is larger than the sum of its proper divisors (20307013035).

40781851893 is an equidigital number, since it uses as much as digits as its factorization.

40781851893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167826566 (or 167826554 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 40781851893 in words is "forty billion, seven hundred eighty-one million, eight hundred fifty-one thousand, eight hundred ninety-three".