7631661361 has 4 divisors (see below), whose sum is σ = 7633070452. Its totient is φ = 7630252272.

The previous prime is 7631661347. The next prime is 7631661377. The reversal of 7631661361 is 1631661367.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1440961600 + 6190699761 = 37960^2 + 78681^2 .

It is a cyclic number.

It is not a de Polignac number, because 7631661361 - 2¹¹ = 7631659313 is a prime.

It is a super-3 number, since 3×7631661361³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7631661161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696390 + ... + 707263.

It is an arithmetic number, because the mean of its divisors is an integer number (1908267613).

Almost surely, 2^7631661361 is an apocalyptic number.

It is an amenable number.

7631661361 is a deficient number, since it is larger than the sum of its proper divisors (1409091).

7631661361 is a wasteful number, since it uses less digits than its factorization.

7631661361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409090.

The product of its digits is 81648, while the sum is 40.

The square root of 7631661361 is about 87359.3804980324. The cubic root of 7631661361 is about 1968.8215925644.

The spelling of 7631661361 in words is "seven billion, six hundred thirty-one million, six hundred sixty-one thousand, three hundred sixty-one".