40136164021 has 2 divisors, whose sum is σ = 40136164022. Its totient is φ = 40136164020.

The previous prime is 40136163979. The next prime is 40136164139. The reversal of 40136164021 is 12046163104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37564254225 + 2571909796 = 193815^2 + 50714^2 .

It is a cyclic number.

It is not a de Polignac number, because 40136164021 - 2¹⁷ = 40136032949 is a prime.

It is a super-2 number, since 2×40136164021² (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 (40136164921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20068082010 + 20068082011.

It is an arithmetic number, because the mean of its divisors is an integer number (20068082011).

Almost surely, 2^40136164021 is an apocalyptic number.

It is an amenable number.

40136164021 is a deficient number, since it is larger than the sum of its proper divisors (1).

40136164021 is an equidigital number, since it uses as much as digits as its factorization.

40136164021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 40136164021 in words is "forty billion, one hundred thirty-six million, one hundred sixty-four thousand, twenty-one".