49540021565 has 8 divisors (see below), whose sum is σ = 59449358808. Its totient is φ = 39631128640.

The previous prime is 49540021543. The next prime is 49540021567. The reversal of 49540021565 is 56512004594.

It can be written as a sum of positive squares in 4 ways, for example, as 5529855769 + 44010165796 = 74363^2 + 209786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 49540021565 - 2¹⁴ = 49540005181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49540021567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228719 + ... + 389091.

It is an arithmetic number, because the mean of its divisors is an integer number (7431169851).

Almost surely, 2^49540021565 is an apocalyptic number.

It is an amenable number.

49540021565 is a deficient number, since it is larger than the sum of its proper divisors (9909337243).

49540021565 is a wasteful number, since it uses less digits than its factorization.

49540021565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222159.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 49540021565 in words is "forty-nine billion, five hundred forty million, twenty-one thousand, five hundred sixty-five".