78203781034657 has 4 divisors (see below), whose sum is σ = 78252445492416. Its totient is φ = 78155116576900.

The previous prime is 78203781034591. The next prime is 78203781034661. The reversal of 78203781034657 is 75643018730287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78203781034657 - 2³⁹ = 77654025220769 is a prime.

It is a super-2 number, since 2×78203781034657² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78203781034595 and 78203781034604.

It is not an unprimeable number, because it can be changed into a prime (78203782034657) 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, 24332226469 + ... + 24332229682.

It is an arithmetic number, because the mean of its divisors is an integer number (19563111373104).

Almost surely, 2^{78203781034657} is an apocalyptic number.

It is an amenable number.

78203781034657 is a deficient number, since it is larger than the sum of its proper divisors (48664457759).

78203781034657 is a wasteful number, since it uses less digits than its factorization.

78203781034657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48664457758.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 78203781034657 in words is "seventy-eight trillion, two hundred three billion, seven hundred eighty-one million, thirty-four thousand, six hundred fifty-seven".