40691780691 has 16 divisors (see below), whose sum is σ = 55900536480. Its totient is φ = 26316942080.

The previous prime is 40691780687. The next prime is 40691780729. The reversal of 40691780691 is 19608719604.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 40691780691 - 2² = 40691780687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40691780671) 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 15 ways as a sum of consecutive naturals, for example, 1423620 + ... + 1451921.

It is an arithmetic number, because the mean of its divisors is an integer number (3493783530).

Almost surely, 2^40691780691 is an apocalyptic number.

40691780691 is a deficient number, since it is larger than the sum of its proper divisors (15208755789).

40691780691 is a wasteful number, since it uses less digits than its factorization.

40691780691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875686.

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 40691780691 in words is "forty billion, six hundred ninety-one million, seven hundred eighty thousand, six hundred ninety-one".