78099983877 has 4 divisors (see below), whose sum is σ = 104133311840. Its totient is φ = 52066655916.

The previous prime is 78099983809. The next prime is 78099983887. The reversal of 78099983877 is 77838999087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77838999087 = 3 ⋅25946333029.

It is not a de Polignac number, because 78099983877 - 2¹¹ = 78099981829 is a prime.

It is a super-2 number, since 2×78099983877² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78099983799 and 78099983808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78099983807) 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, 13016663977 + ... + 13016663982.

It is an arithmetic number, because the mean of its divisors is an integer number (26033327960).

Almost surely, 2^78099983877 is an apocalyptic number.

It is an amenable number.

78099983877 is a deficient number, since it is larger than the sum of its proper divisors (26033327963).

78099983877 is a wasteful number, since it uses less digits than its factorization.

78099983877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26033327962.

The product of its (nonzero) digits is 384072192, while the sum is 75.

The spelling of 78099983877 in words is "seventy-eight billion, ninety-nine million, nine hundred eighty-three thousand, eight hundred seventy-seven".