2625629661 has 20 divisors (see below), whose sum is σ = 4048764544. Its totient is φ = 1693953000.

The previous prime is 2625629597. The next prime is 2625629663. The reversal of 2625629661 is 1669265262.

It is a happy number.

2625629661 is a `hidden beast` number, since 26 + 2 + 562 + 9 + 6 + 61 = 666.

It is not a de Polignac number, because 2625629661 - 2⁶ = 2625629597 is a prime.

It is a super-2 number, since 2×2625629661² = 13787862233445949842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2625629663) 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 19 ways as a sum of consecutive naturals, for example, 520315 + ... + 525336.

Almost surely, 2^2625629661 is an apocalyptic number.

It is an amenable number.

2625629661 is a deficient number, since it is larger than the sum of its proper divisors (1423134883).

2625629661 is a wasteful number, since it uses less digits than its factorization.

2625629661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045694 (or 1045685 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 2625629661 is about 51240.8983235072. The cubic root of 2625629661 is about 1379.5723769572.

The spelling of 2625629661 in words is "two billion, six hundred twenty-five million, six hundred twenty-nine thousand, six hundred sixty-one".