78142324691 has 8 divisors (see below), whose sum is σ = 79892958720. Its totient is φ = 76395358728.

The previous prime is 78142324669. The next prime is 78142324693. The reversal of 78142324691 is 19642324187.

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

It is a cyclic number.

It is not a de Polignac number, because 78142324691 - 2¹⁰ = 78142323667 is a prime.

It is a super-2 number, since 2×78142324691² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78142324693) 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, 873911 + ... + 959168.

It is an arithmetic number, because the mean of its divisors is an integer number (9986619840).

Almost surely, 2^78142324691 is an apocalyptic number.

78142324691 is a deficient number, since it is larger than the sum of its proper divisors (1750634029).

78142324691 is a wasteful number, since it uses less digits than its factorization.

78142324691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834033.

The product of its digits is 580608, while the sum is 47.

The spelling of 78142324691 in words is "seventy-eight billion, one hundred forty-two million, three hundred twenty-four thousand, six hundred ninety-one".