39147039979777 has 2 divisors, whose sum is σ = 39147039979778. Its totient is φ = 39147039979776.

The previous prime is 39147039979739. The next prime is 39147039979783. The reversal of 39147039979777 is 77797993074193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32581766305936 + 6565273673841 = 5708044^2 + 2562279^2 .

It is a cyclic number.

It is not a de Polignac number, because 39147039979777 - 2²³ = 39147031591169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39147039979777.

It is not a weakly prime, because it can be changed into another prime (39147039979877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19573519989888 + 19573519989889.

It is an arithmetic number, because the mean of its divisors is an integer number (19573519989889).

Almost surely, 2^{39147039979777} is an apocalyptic number.

It is an amenable number.

39147039979777 is a deficient number, since it is larger than the sum of its proper divisors (1).

39147039979777 is an equidigital number, since it uses as much as digits as its factorization.

39147039979777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969746172, while the sum is 82.

The spelling of 39147039979777 in words is "thirty-nine trillion, one hundred forty-seven billion, thirty-nine million, nine hundred seventy-nine thousand, seven hundred seventy-seven".