40145297897991 has 24 divisors (see below), whose sum is σ = 63361343246320. Its totient is φ = 22458907912320.

The previous prime is 40145297897981. The next prime is 40145297898023. The reversal of 40145297897991 is 19979879254104.

It is not a de Polignac number, because 40145297897991 - 2¹³ = 40145297889799 is a prime.

It is a super-2 number, since 2×40145297897991² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40145297897981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4253576326 + ... + 4253585763.

Almost surely, 2^{40145297897991} is an apocalyptic number.

40145297897991 is a deficient number, since it is larger than the sum of its proper divisors (23216045348329).

40145297897991 is a wasteful number, since it uses less digits than its factorization.

40145297897991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507162127 (or 8507162116 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 75.

The spelling of 40145297897991 in words is "forty trillion, one hundred forty-five billion, two hundred ninety-seven million, eight hundred ninety-seven thousand, nine hundred ninety-one".