49697985791 has 4 divisors (see below), whose sum is σ = 50755389792. Its totient is φ = 48640581792.

The previous prime is 49697985769. The next prime is 49697985817. The reversal of 49697985791 is 19758979694.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49697985791 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 (49697985991) 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, 528701930 + ... + 528702023.

It is an arithmetic number, because the mean of its divisors is an integer number (12688847448).

Almost surely, 2^49697985791 is an apocalyptic number.

49697985791 is a deficient number, since it is larger than the sum of its proper divisors (1057404001).

49697985791 is a wasteful number, since it uses less digits than its factorization.

49697985791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057404000.

The product of its digits is 308629440, while the sum is 74.

The spelling of 49697985791 in words is "forty-nine billion, six hundred ninety-seven million, nine hundred eighty-five thousand, seven hundred ninety-one".