77959500819 has 4 divisors (see below), whose sum is σ = 103946001096. Its totient is φ = 51973000544.

The previous prime is 77959500809. The next prime is 77959500833. The reversal of 77959500819 is 91800595977.

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 77959500819 - 2¹⁹ = 77958976531 is a prime.

It is a super-2 number, since 2×77959500819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77959500809) 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, 12993250134 + ... + 12993250139.

It is an arithmetic number, because the mean of its divisors is an integer number (25986500274).

Almost surely, 2^77959500819 is an apocalyptic number.

77959500819 is a deficient number, since it is larger than the sum of its proper divisors (25986500277).

77959500819 is a wasteful number, since it uses less digits than its factorization.

77959500819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25986500276.

The product of its (nonzero) digits is 7144200, while the sum is 60.

The spelling of 77959500819 in words is "seventy-seven billion, nine hundred fifty-nine million, five hundred thousand, eight hundred nineteen".