77219489161 has 4 divisors (see below), whose sum is σ = 77227478532. Its totient is φ = 77211499792.

The previous prime is 77219489131. The next prime is 77219489201. The reversal of 77219489161 is 16198491277.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16198491277 = 1327 ⋅12206851.

It can be written as a sum of positive squares in 2 ways, for example, as 37425223936 + 39794265225 = 193456^2 + 199485^2 .

It is a cyclic number.

It is not a de Polignac number, because 77219489161 - 2⁷ = 77219489033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77219489131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3980170 + ... + 3999523.

It is an arithmetic number, because the mean of its divisors is an integer number (19306869633).

Almost surely, 2^77219489161 is an apocalyptic number.

It is an amenable number.

77219489161 is a deficient number, since it is larger than the sum of its proper divisors (7989371).

77219489161 is an equidigital number, since it uses as much as digits as its factorization.

77219489161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7989370.

The product of its digits is 1524096, while the sum is 55.

The spelling of 77219489161 in words is "seventy-seven billion, two hundred nineteen million, four hundred eighty-nine thousand, one hundred sixty-one".