78159863402 has 8 divisors (see below), whose sum is σ = 117268762500. Its totient is φ = 39070275904.

The previous prime is 78159863401. The next prime is 78159863461. The reversal of 78159863402 is 20436895187.

It can be written as a sum of positive squares in 2 ways, for example, as 71925339721 + 6234523681 = 268189^2 + 78959^2 .

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

It is a super-2 number, since 2×78159863402² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78159863401) 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, 4817777 + ... + 4833972.

It is a 2-persistent number, because it is pandigital, and so is 2⋅78159863402 = 156319726804, but 3⋅78159863402 = 234479590206 is not.

Almost surely, 2^78159863402 is an apocalyptic number.

78159863402 is a deficient number, since it is larger than the sum of its proper divisors (39108899098).

78159863402 is a wasteful number, since it uses less digits than its factorization.

78159863402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9655800.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 78159863402 in words is "seventy-eight billion, one hundred fifty-nine million, eight hundred sixty-three thousand, four hundred two".