39954659561 has 4 divisors (see below), whose sum is σ = 42057536400. Its totient is φ = 37851782724.

The previous prime is 39954659501. The next prime is 39954659617. The reversal of 39954659561 is 16595645993.

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 39954659561 - 2²² = 39950465257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39954659494 and 39954659503.

It is not an unprimeable number, because it can be changed into a prime (39954659501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051438391 + ... + 1051438428.

It is an arithmetic number, because the mean of its divisors is an integer number (10514384100).

Almost surely, 2^39954659561 is an apocalyptic number.

It is an amenable number.

39954659561 is a deficient number, since it is larger than the sum of its proper divisors (2102876839).

39954659561 is a wasteful number, since it uses less digits than its factorization.

39954659561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102876838.

The product of its digits is 39366000, while the sum is 62.

The spelling of 39954659561 in words is "thirty-nine billion, nine hundred fifty-four million, six hundred fifty-nine thousand, five hundred sixty-one".