49179621857 has 2 divisors, whose sum is σ = 49179621858. Its totient is φ = 49179621856.

The previous prime is 49179621787. The next prime is 49179621917. The reversal of 49179621857 is 75812697194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48892285456 + 287336401 = 221116^2 + 16951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49179621857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 49179621796 and 49179621805.

It is not a weakly prime, because it can be changed into another prime (49179629857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24589810928 + 24589810929.

It is an arithmetic number, because the mean of its divisors is an integer number (24589810929).

Almost surely, 2^49179621857 is an apocalyptic number.

It is an amenable number.

49179621857 is a deficient number, since it is larger than the sum of its proper divisors (1).

49179621857 is an equidigital number, since it uses as much as digits as its factorization.

49179621857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The spelling of 49179621857 in words is "forty-nine billion, one hundred seventy-nine million, six hundred twenty-one thousand, eight hundred fifty-seven".