78242180697 has 6 divisors (see below), whose sum is σ = 113016483242. Its totient is φ = 52161453792.

The previous prime is 78242180683. The next prime is 78242180707. The reversal of 78242180697 is 79608124287.

It is a happy number.

78242180697 is a `hidden beast` number, since 7 + 82 + 421 + 80 + 69 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 77879506761 + 362673936 = 279069^2 + 19044^2 .

It is not a de Polignac number, because 78242180697 - 2¹² = 78242176601 is a prime.

It is a super-2 number, since 2×78242180697² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78242180657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4346787808 + ... + 4346787825.

Almost surely, 2^78242180697 is an apocalyptic number.

It is an amenable number.

78242180697 is a deficient number, since it is larger than the sum of its proper divisors (34774302545).

78242180697 is a wasteful number, since it uses less digits than its factorization.

78242180697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693575639 (or 8693575636 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 78242180697 in words is "seventy-eight billion, two hundred forty-two million, one hundred eighty thousand, six hundred ninety-seven".