19979410777 has 2 divisors, whose sum is σ = 19979410778. Its totient is φ = 19979410776.

The previous prime is 19979410733. The next prime is 19979410799. The reversal of 19979410777 is 77701497991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18303654681 + 1675756096 = 135291^2 + 40936^2 .

It is a cyclic number.

It is not a de Polignac number, because 19979410777 - 2³¹ = 17831927129 is a prime.

It is a super-2 number, since 2×19979410777² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19979410177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989705388 + 9989705389.

It is an arithmetic number, because the mean of its divisors is an integer number (9989705389).

Almost surely, 2^19979410777 is an apocalyptic number.

It is an amenable number.

19979410777 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979410777 is an equidigital number, since it uses as much as digits as its factorization.

19979410777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7001316, while the sum is 61.

The spelling of 19979410777 in words is "nineteen billion, nine hundred seventy-nine million, four hundred ten thousand, seven hundred seventy-seven".