78999001001 has 4 divisors (see below), whose sum is σ = 81547355904. Its totient is φ = 76450646100.

The previous prime is 78999000991. The next prime is 78999001009. The reversal of 78999001001 is 10010099987.

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.

It is a cyclic number.

It is not a de Polignac number, because 78999001001 - 2⁶ = 78999000937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78999001009) 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, 1274177405 + ... + 1274177466.

It is an arithmetic number, because the mean of its divisors is an integer number (20386838976).

Almost surely, 2^78999001001 is an apocalyptic number.

It is an amenable number.

78999001001 is a deficient number, since it is larger than the sum of its proper divisors (2548354903).

78999001001 is a wasteful number, since it uses less digits than its factorization.

78999001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548354902.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 78999001001 in words is "seventy-eight billion, nine hundred ninety-nine million, one thousand, one".