40172978941 has 2 divisors, whose sum is σ = 40172978942. Its totient is φ = 40172978940.

The previous prime is 40172978933. The next prime is 40172978977. The reversal of 40172978941 is 14987927104.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33799351716 + 6373627225 = 183846^2 + 79835^2 .

It is a cyclic number.

It is not a de Polignac number, because 40172978941 - 2³ = 40172978933 is a prime.

It is a super-2 number, since 2×40172978941² (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 (40172978921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086489470 + 20086489471.

It is an arithmetic number, because the mean of its divisors is an integer number (20086489471).

Almost surely, 2^40172978941 is an apocalyptic number.

It is an amenable number.

40172978941 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172978941 is an equidigital number, since it uses as much as digits as its factorization.

40172978941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 40172978941 in words is "forty billion, one hundred seventy-two million, nine hundred seventy-eight thousand, nine hundred forty-one".