40697540691 has 4 divisors (see below), whose sum is σ = 54263387592. Its totient is φ = 27131693792.

The previous prime is 40697540669. The next prime is 40697540701. The reversal of 40697540691 is 19604579604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40697540691 - 2⁶ = 40697540627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40697500691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782923446 + ... + 6782923451.

It is an arithmetic number, because the mean of its divisors is an integer number (13565846898).

Almost surely, 2^40697540691 is an apocalyptic number.

40697540691 is a deficient number, since it is larger than the sum of its proper divisors (13565846901).

40697540691 is a wasteful number, since it uses less digits than its factorization.

40697540691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13565846900.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 40697540691 in words is "forty billion, six hundred ninety-seven million, five hundred forty thousand, six hundred ninety-one".