40691780851 has 2 divisors, whose sum is σ = 40691780852. Its totient is φ = 40691780850.

The previous prime is 40691780791. The next prime is 40691780879. The reversal of 40691780851 is 15808719604.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40691780851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40691780795 and 40691780804.

It is not a weakly prime, because it can be changed into another prime (40691780891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20345890425 + 20345890426.

It is an arithmetic number, because the mean of its divisors is an integer number (20345890426).

Almost surely, 2^40691780851 is an apocalyptic number.

40691780851 is a deficient number, since it is larger than the sum of its proper divisors (1).

40691780851 is an equidigital number, since it uses as much as digits as its factorization.

40691780851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 40691780851 in words is "forty billion, six hundred ninety-one million, seven hundred eighty thousand, eight hundred fifty-one".