40172997773 has 2 divisors, whose sum is σ = 40172997774. Its totient is φ = 40172997772.

The previous prime is 40172997769. The next prime is 40172997803. The reversal of 40172997773 is 37779927104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39647579689 + 525418084 = 199117^2 + 22922^2 .

It is a cyclic number.

It is not a de Polignac number, because 40172997773 - 2² = 40172997769 is a prime.

It is a super-2 number, since 2×40172997773² (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 (40172997673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20086498886 + 20086498887.

It is an arithmetic number, because the mean of its divisors is an integer number (20086498887).

Almost surely, 2^40172997773 is an apocalyptic number.

It is an amenable number.

40172997773 is a deficient number, since it is larger than the sum of its proper divisors (1).

40172997773 is an equidigital number, since it uses as much as digits as its factorization.

40172997773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4667544, while the sum is 56.

The spelling of 40172997773 in words is "forty billion, one hundred seventy-two million, nine hundred ninety-seven thousand, seven hundred seventy-three".