49564991991 has 16 divisors (see below), whose sum is σ = 69787178240. Its totient is φ = 31204180800.

The previous prime is 49564991969. The next prime is 49564991999. The reversal of 49564991991 is 19919946594.

It is not a de Polignac number, because 49564991991 - 2²² = 49560797687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49564991999) 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, 1371235 + ... + 1406916.

It is an arithmetic number, because the mean of its divisors is an integer number (4361698640).

Almost surely, 2^49564991991 is an apocalyptic number.

49564991991 is a deficient number, since it is larger than the sum of its proper divisors (20222186249).

49564991991 is a wasteful number, since it uses less digits than its factorization.

49564991991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778486.

The product of its digits is 28343520, while the sum is 66.

The spelling of 49564991991 in words is "forty-nine billion, five hundred sixty-four million, nine hundred ninety-one thousand, nine hundred ninety-one".