905951981943 has 16 divisors (see below), whose sum is σ = 1342258556160. Its totient is φ = 603919625688.

The previous prime is 905951981939. The next prime is 905951982059. The reversal of 905951981943 is 349189159509.

It is not a de Polignac number, because 905951981943 - 2² = 905951981939 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905951981933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998355 + ... + 1675892.

It is an arithmetic number, because the mean of its divisors is an integer number (83891159760).

Almost surely, 2^905951981943 is an apocalyptic number.

905951981943 is a deficient number, since it is larger than the sum of its proper divisors (436306574217).

905951981943 is a wasteful number, since it uses less digits than its factorization.

905951981943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686803 (or 2686797 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 63.

The spelling of 905951981943 in words is "nine hundred five billion, nine hundred fifty-one million, nine hundred eighty-one thousand, nine hundred forty-three".