7626605780161 has 9 divisors (see below), whose sum is σ = 8049187794531. Its totient is φ = 7225155766584.

The previous prime is 7626605780141. The next prime is 7626605780173. The reversal of 7626605780161 is 1610875066267.

The square root of 7626605780161 is 2761631.

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., 2258765520561 + 5367840259600 = 1502919^2 + 2316860^2 .

It is not a de Polignac number, because 7626605780161 - 2³¹ = 7624458296513 is a prime.

It is a super-2 number, since 2×7626605780161² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7626605780141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 52398315 + ... + 52543663.

Almost surely, 2^{7626605780161} is an apocalyptic number.

7626605780161 is the 2761631-st square number.

7626605780161 is the 1380816-th centered octagonal number.

It is an amenable number.

7626605780161 is a deficient number, since it is larger than the sum of its proper divisors (422582014370).

7626605780161 is an frugal number, since it uses more digits than its factorization.

7626605780161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290736 (or 145368 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 7626605780161 in words is "seven trillion, six hundred twenty-six billion, six hundred five million, seven hundred eighty thousand, one hundred sixty-one".