7266788978257 has 8 divisors (see below), whose sum is σ = 7682080966560. Its totient is φ = 6854779931040.

The previous prime is 7266788978233. The next prime is 7266788978287. The reversal of 7266788978257 is 7528798876627.

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 7266788978257 - 2¹⁵ = 7266788945489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7266788978287) 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, 820730719 + ... + 820739572.

It is an arithmetic number, because the mean of its divisors is an integer number (960260120820).

Almost surely, 2^{7266788978257} is an apocalyptic number.

It is an amenable number.

7266788978257 is a deficient number, since it is larger than the sum of its proper divisors (415291988303).

7266788978257 is a wasteful number, since it uses less digits than its factorization.

7266788978257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641470543.

The product of its digits is 7965941760, while the sum is 82.

The spelling of 7266788978257 in words is "seven trillion, two hundred sixty-six billion, seven hundred eighty-eight million, nine hundred seventy-eight thousand, two hundred fifty-seven".