77207851388909 has 2 divisors, whose sum is σ = 77207851388910. Its totient is φ = 77207851388908.

The previous prime is 77207851388879. The next prime is 77207851388929. The reversal of 77207851388909 is 90988315870277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75660944788900 + 1546906600009 = 8698330^2 + 1243747^2 .

It is a cyclic number.

It is not a de Polignac number, because 77207851388909 - 2¹⁶ = 77207851323373 is a prime.

It is a super-2 number, since 2×77207851388909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77207851388929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38603925694454 + 38603925694455.

It is an arithmetic number, because the mean of its divisors is an integer number (38603925694455).

Almost surely, 2^{77207851388909} is an apocalyptic number.

It is an amenable number.

77207851388909 is a deficient number, since it is larger than the sum of its proper divisors (1).

77207851388909 is an equidigital number, since it uses as much as digits as its factorization.

77207851388909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 426746880, while the sum is 74.

The spelling of 77207851388909 in words is "seventy-seven trillion, two hundred seven billion, eight hundred fifty-one million, three hundred eighty-eight thousand, nine hundred nine".