78298388566 has 4 divisors (see below), whose sum is σ = 117447582852. Its totient is φ = 39149194282.

The previous prime is 78298388563. The next prime is 78298388569. The reversal of 78298388566 is 66588389287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78298388563) and next prime (78298388569).

It is a super-2 number, since 2×78298388566² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78298388495 and 78298388504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78298388563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19574597140 + ... + 19574597143.

It is an arithmetic number, because the mean of its divisors is an integer number (29361895713).

Almost surely, 2^78298388566 is an apocalyptic number.

78298388566 is a deficient number, since it is larger than the sum of its proper divisors (39149194286).

78298388566 is a wasteful number, since it uses less digits than its factorization.

78298388566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39149194285.

The product of its digits is 278691840, while the sum is 70.

The spelling of 78298388566 in words is "seventy-eight billion, two hundred ninety-eight million, three hundred eighty-eight thousand, five hundred sixty-six".