78916018821 has 8 divisors (see below), whose sum is σ = 106263154464. Its totient is φ = 52089781200.

The previous prime is 78916018807. The next prime is 78916018823. The reversal of 78916018821 is 12881061987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78916018821 - 2⁷ = 78916018693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78916018823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130224151 + ... + 130224756.

It is an arithmetic number, because the mean of its divisors is an integer number (13282894308).

Almost surely, 2^78916018821 is an apocalyptic number.

It is an amenable number.

78916018821 is a deficient number, since it is larger than the sum of its proper divisors (27347135643).

78916018821 is a wasteful number, since it uses less digits than its factorization.

78916018821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260449011.

The product of its (nonzero) digits is 387072, while the sum is 51.

The spelling of 78916018821 in words is "seventy-eight billion, nine hundred sixteen million, eighteen thousand, eight hundred twenty-one".