78277051819 has 4 divisors (see below), whose sum is σ = 78278223096. Its totient is φ = 78275880544.

The previous prime is 78277051799. The next prime is 78277051829. The reversal of 78277051819 is 91815077287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91815077287 = 587 ⋅156414101.

It is a cyclic number.

It is not a de Polignac number, because 78277051819 - 2¹⁷ = 78276920747 is a prime.

It is a super-2 number, since 2×78277051819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78277051819.

It is not an unprimeable number, because it can be changed into a prime (78277051829) 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, 478909 + ... + 621214.

It is an arithmetic number, because the mean of its divisors is an integer number (19569555774).

Almost surely, 2^78277051819 is an apocalyptic number.

78277051819 is a deficient number, since it is larger than the sum of its proper divisors (1171277).

78277051819 is a wasteful number, since it uses less digits than its factorization.

78277051819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171276.

The product of its (nonzero) digits is 1975680, while the sum is 55.

The spelling of 78277051819 in words is "seventy-eight billion, two hundred seventy-seven million, fifty-one thousand, eight hundred nineteen".