78203957697 has 6 divisors (see below), whose sum is σ = 112961272242. Its totient is φ = 52135971792.

The previous prime is 78203957669. The next prime is 78203957717. The reversal of 78203957697 is 79675930287.

78203957697 is a `hidden beast` number, since 7 + 8 + 20 + 39 + 576 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58949897616 + 19254060081 = 242796^2 + 138759^2 .

It is not a de Polignac number, because 78203957697 - 2¹⁰ = 78203956673 is a prime.

It is a super-2 number, since 2×78203957697² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78203957647) 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, 4344664308 + ... + 4344664325.

It is an arithmetic number, because the mean of its divisors is an integer number (18826878707).

Almost surely, 2^78203957697 is an apocalyptic number.

It is an amenable number.

78203957697 is a deficient number, since it is larger than the sum of its proper divisors (34757314545).

78203957697 is a wasteful number, since it uses less digits than its factorization.

78203957697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8689328639 (or 8689328636 counting only the distinct ones).

The product of its (nonzero) digits is 40007520, while the sum is 63.

The spelling of 78203957697 in words is "seventy-eight billion, two hundred three million, nine hundred fifty-seven thousand, six hundred ninety-seven".