49659661819 has 2 divisors, whose sum is σ = 49659661820. Its totient is φ = 49659661818.

The previous prime is 49659661787. The next prime is 49659661853. The reversal of 49659661819 is 91816695694.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 49659661819 - 2⁵ = 49659661787 is a prime.

It is a super-2 number, since 2×49659661819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (49659661889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24829830909 + 24829830910.

It is an arithmetic number, because the mean of its divisors is an integer number (24829830910).

Almost surely, 2^49659661819 is an apocalyptic number.

49659661819 is a deficient number, since it is larger than the sum of its proper divisors (1).

49659661819 is an equidigital number, since it uses as much as digits as its factorization.

49659661819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25194240, while the sum is 64.

The spelling of 49659661819 in words is "forty-nine billion, six hundred fifty-nine million, six hundred sixty-one thousand, eight hundred nineteen".