77641407719 has 4 divisors (see below), whose sum is σ = 79447021896. Its totient is φ = 75835793544.

The previous prime is 77641407689. The next prime is 77641407721. The reversal of 77641407719 is 91770414677.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77641407719 - 2¹⁶ = 77641342183 is a prime.

It is a super-2 number, since 2×77641407719² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77641407749) 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, 902807024 + ... + 902807109.

It is an arithmetic number, because the mean of its divisors is an integer number (19861755474).

Almost surely, 2^77641407719 is an apocalyptic number.

77641407719 is a deficient number, since it is larger than the sum of its proper divisors (1805614177).

77641407719 is a wasteful number, since it uses less digits than its factorization.

77641407719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805614176.

The product of its (nonzero) digits is 2074464, while the sum is 53.

The spelling of 77641407719 in words is "seventy-seven billion, six hundred forty-one million, four hundred seven thousand, seven hundred nineteen".