78397667997 has 16 divisors (see below), whose sum is σ = 115639073280. Its totient is φ = 46844529200.

The previous prime is 78397667989. The next prime is 78397668001. The reversal of 78397667997 is 79976679387.

It is a cyclic number.

It is not a de Polignac number, because 78397667997 - 2³ = 78397667989 is a prime.

It is a super-2 number, since 2×78397667997² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78397667917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16727847 + ... + 16732532.

It is an arithmetic number, because the mean of its divisors is an integer number (7227442080).

Almost surely, 2^78397667997 is an apocalyptic number.

It is an amenable number.

78397667997 is a deficient number, since it is larger than the sum of its proper divisors (37241405283).

78397667997 is a wasteful number, since it uses less digits than its factorization.

78397667997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33460464.

The product of its digits is 1512284256, while the sum is 78.

The spelling of 78397667997 in words is "seventy-eight billion, three hundred ninety-seven million, six hundred sixty-seven thousand, nine hundred ninety-seven".