40001999968 has 24 divisors (see below), whose sum is σ = 90004500432. Its totient is φ = 17143714176.

The previous prime is 40001999867. The next prime is 40001999971. The reversal of 40001999968 is 86999910004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89289955 + ... + 89290402.

It is an arithmetic number, because the mean of its divisors is an integer number (3750187518).

Almost surely, 2^40001999968 is an apocalyptic number.

It is an amenable number.

40001999968 is an abundant number, since it is smaller than the sum of its proper divisors (50002500464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40001999968 is a wasteful number, since it uses less digits than its factorization.

40001999968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178580374 (or 178580366 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 40001999968 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred sixty-eight".