494396015689 has 27 divisors (see below), whose sum is σ = 545798320263. Its totient is φ = 447732594144.

The previous prime is 494396015609. The next prime is 494396015693. The reversal of 494396015689 is 986510693494.

It is a happy number.

The square root of 494396015689 is 703133.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 483396201289 + 10999814400 = 695267^2 + 104880^2 .

It is not a de Polignac number, because 494396015689 - 2⁹ = 494396015177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 494396015689.

It is not an unprimeable number, because it can be changed into a prime (494396015609) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 307268317 + ... + 307269925.

Almost surely, 2^494396015689 is an apocalyptic number.

494396015689 is the 703133-rd square number.

494396015689 is the 351567-th centered octagonal number.

It is an amenable number.

494396015689 is a deficient number, since it is larger than the sum of its proper divisors (51402304574).

494396015689 is an frugal number, since it uses more digits than its factorization.

494396015689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 64.

Multiplying 494396015689 by its sum of digits (64), we get a square (31641345004096 = 5625064²).

The spelling of 494396015689 in words is "four hundred ninety-four billion, three hundred ninety-six million, fifteen thousand, six hundred eighty-nine".