49619605681 has 2 divisors, whose sum is σ = 49619605682. Its totient is φ = 49619605680.

The previous prime is 49619605663. The next prime is 49619605807. The reversal of 49619605681 is 18650691694.

49619605681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40464943281 + 9154662400 = 201159^2 + 95680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49619605681 is a prime.

It is a super-2 number, since 2×49619605681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (49619605621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24809802840 + 24809802841.

It is an arithmetic number, because the mean of its divisors is an integer number (24809802841).

Almost surely, 2^49619605681 is an apocalyptic number.

It is an amenable number.

49619605681 is a deficient number, since it is larger than the sum of its proper divisors (1).

49619605681 is an equidigital number, since it uses as much as digits as its factorization.

49619605681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 49619605681 in words is "forty-nine billion, six hundred nineteen million, six hundred five thousand, six hundred eighty-one".