40697997181 has 2 divisors, whose sum is σ = 40697997182. Its totient is φ = 40697997180.

The previous prime is 40697997149. The next prime is 40697997187. The reversal of 40697997181 is 18179979604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38231980900 + 2466016281 = 195530^2 + 49659^2 .

It is a cyclic number.

It is not a de Polignac number, because 40697997181 - 2⁵ = 40697997149 is a prime.

It is a super-2 number, since 2×40697997181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40697997187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20348998590 + 20348998591.

It is an arithmetic number, because the mean of its divisors is an integer number (20348998591).

Almost surely, 2^40697997181 is an apocalyptic number.

It is an amenable number.

40697997181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40697997181 is an equidigital number, since it uses as much as digits as its factorization.

40697997181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 61.

The spelling of 40697997181 in words is "forty billion, six hundred ninety-seven million, nine hundred ninety-seven thousand, one hundred eighty-one".