40164021668 has 6 divisors (see below), whose sum is σ = 70287037926. Its totient is φ = 20082010832.

The previous prime is 40164021641. The next prime is 40164021671. The reversal of 40164021668 is 86612046104.

It can be written as a sum of positive squares in only one way, i.e., 39550072384 + 613949284 = 198872^2 + 24778^2 .

It is a super-2 number, since 2×40164021668² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5020502705 + ... + 5020502712.

It is an arithmetic number, because the mean of its divisors is an integer number (11714506321).

Almost surely, 2^40164021668 is an apocalyptic number.

It is an amenable number.

40164021668 is a deficient number, since it is larger than the sum of its proper divisors (30123016258).

40164021668 is a wasteful number, since it uses less digits than its factorization.

40164021668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041005421 (or 10041005419 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 40164021668 in words is "forty billion, one hundred sixty-four million, twenty-one thousand, six hundred sixty-eight".