40649235381 has 12 divisors (see below), whose sum is σ = 62169419052. Its totient is φ = 25505402496.

The previous prime is 40649235373. The next prime is 40649235401. The reversal of 40649235381 is 18353294604.

40649235381 is a `hidden beast` number, since 406 + 4 + 9 + 235 + 3 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 32178978225 + 8470257156 = 179385^2 + 92034^2 .

It is not a de Polignac number, because 40649235381 - 2³ = 40649235373 is a prime.

It is a super-2 number, since 2×40649235381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40649235281) 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, 132840486 + ... + 132840791.

It is an arithmetic number, because the mean of its divisors is an integer number (5180784921).

Almost surely, 2^40649235381 is an apocalyptic number.

It is an amenable number.

40649235381 is a deficient number, since it is larger than the sum of its proper divisors (21520183671).

40649235381 is a wasteful number, since it uses less digits than its factorization.

40649235381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265681300 (or 265681297 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 40649235381 in words is "forty billion, six hundred forty-nine million, two hundred thirty-five thousand, three hundred eighty-one".