2626554661 has 4 divisors (see below), whose sum is σ = 2764794400. Its totient is φ = 2488314924.

The previous prime is 2626554643. The next prime is 2626554683. The reversal of 2626554661 is 1664556262.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2626554661 - 2⁹ = 2626554149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2626551661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69119841 + ... + 69119878.

It is an arithmetic number, because the mean of its divisors is an integer number (691198600).

Almost surely, 2^2626554661 is an apocalyptic number.

It is an amenable number.

2626554661 is a deficient number, since it is larger than the sum of its proper divisors (138239739).

2626554661 is a wasteful number, since it uses less digits than its factorization.

2626554661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138239738.

The product of its digits is 518400, while the sum is 43.

The square root of 2626554661 is about 51249.9235218942. The cubic root of 2626554661 is about 1379.7343640850.

The spelling of 2626554661 in words is "two billion, six hundred twenty-six million, five hundred fifty-four thousand, six hundred sixty-one".