78901335257 has 8 divisors (see below), whose sum is σ = 80011857384. Its totient is φ = 77791615488.

The previous prime is 78901335217. The next prime is 78901335263. The reversal of 78901335257 is 75253310987.

It can be written as a sum of positive squares in 4 ways, for example, as 38867728201 + 40033607056 = 197149^2 + 200084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78901335257 - 2⁶ = 78901335193 is a prime.

It is a super-2 number, since 2×78901335257² (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 (78901335217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 397245.

It is an arithmetic number, because the mean of its divisors is an integer number (10001482173).

Almost surely, 2^78901335257 is an apocalyptic number.

It is an amenable number.

78901335257 is a deficient number, since it is larger than the sum of its proper divisors (1110522127).

78901335257 is a wasteful number, since it uses less digits than its factorization.

78901335257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401179.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 78901335257 in words is "seventy-eight billion, nine hundred one million, three hundred thirty-five thousand, two hundred fifty-seven".