39905771961 has 16 divisors (see below), whose sum is σ = 58050802368. Its totient is φ = 24182798400.

The previous prime is 39905771957. The next prime is 39905771989. The reversal of 39905771961 is 16917750993.

It is not a de Polignac number, because 39905771961 - 2² = 39905771957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39905771921) 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, 288031 + ... + 403451.

It is an arithmetic number, because the mean of its divisors is an integer number (3628175148).

Almost surely, 2^39905771961 is an apocalyptic number.

It is an amenable number.

39905771961 is a deficient number, since it is larger than the sum of its proper divisors (18145030407).

39905771961 is a wasteful number, since it uses less digits than its factorization.

39905771961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125912.

The product of its (nonzero) digits is 3214890, while the sum is 57.

The spelling of 39905771961 in words is "thirty-nine billion, nine hundred five million, seven hundred seventy-one thousand, nine hundred sixty-one".