19979539061 has 2 divisors, whose sum is σ = 19979539062. Its totient is φ = 19979539060.

The previous prime is 19979539043. The next prime is 19979539079. The reversal of 19979539061 is 16093597991.

It is a balanced prime because it is at equal distance from previous prime (19979539043) and next prime (19979539079).

It can be written as a sum of positive squares in only one way, i.e., 19121634961 + 857904100 = 138281^2 + 29290^2 .

It is a cyclic number.

It is not a de Polignac number, because 19979539061 - 2³⁴ = 2799669877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979539001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989769530 + 9989769531.

It is an arithmetic number, because the mean of its divisors is an integer number (9989769531).

Almost surely, 2^19979539061 is an apocalyptic number.

It is an amenable number.

19979539061 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979539061 is an equidigital number, since it uses as much as digits as its factorization.

19979539061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4133430, while the sum is 59.

The spelling of 19979539061 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, sixty-one".