40168849821 has 4 divisors (see below), whose sum is σ = 53558466432. Its totient is φ = 26779233212.

The previous prime is 40168849783. The next prime is 40168849849. The reversal of 40168849821 is 12894886104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40168849821 - 2¹⁷ = 40168718749 is a prime.

It is a super-2 number, since 2×40168849821² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40168847821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6694808301 + ... + 6694808306.

It is an arithmetic number, because the mean of its divisors is an integer number (13389616608).

Almost surely, 2^40168849821 is an apocalyptic number.

It is an amenable number.

40168849821 is a deficient number, since it is larger than the sum of its proper divisors (13389616611).

40168849821 is a wasteful number, since it uses less digits than its factorization.

40168849821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13389616610.

The product of its (nonzero) digits is 884736, while the sum is 51.

The spelling of 40168849821 in words is "forty billion, one hundred sixty-eight million, eight hundred forty-nine thousand, eight hundred twenty-one".