40154695785 has 20 divisors (see below), whose sum is σ = 71981010948. Its totient is φ = 21415837536.

The previous prime is 40154695781. The next prime is 40154695811. The reversal of 40154695785 is 58759645104.

It is a happy number.

40154695785 is a `hidden beast` number, since 4 + 0 + 1 + 5 + 4 + 69 + 578 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18623242089 + 21531453696 = 136467^2 + 146736^2 .

It is not a de Polignac number, because 40154695785 - 2² = 40154695781 is a prime.

It is a super-2 number, since 2×40154695785² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40154695781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49573294 + ... + 49574103.

Almost surely, 2^40154695785 is an apocalyptic number.

40154695785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40154695785 is a deficient number, since it is larger than the sum of its proper divisors (31826315163).

40154695785 is an equidigital number, since it uses as much as digits as its factorization.

40154695785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99147414 (or 99147405 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 54.

The spelling of 40154695785 in words is "forty billion, one hundred fifty-four million, six hundred ninety-five thousand, seven hundred eighty-five".