2554311661 has 16 divisors (see below), whose sum is σ = 2825706240. Its totient is φ = 2289530880.

The previous prime is 2554311649. The next prime is 2554311689. The reversal of 2554311661 is 1661134552.

It is a cyclic number.

It is not a de Polignac number, because 2554311661 - 2⁷ = 2554311533 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 (2554311601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812685 + ... + 815821.

It is an arithmetic number, because the mean of its divisors is an integer number (176606640).

Almost surely, 2^2554311661 is an apocalyptic number.

It is an amenable number.

2554311661 is a deficient number, since it is larger than the sum of its proper divisors (271394579).

2554311661 is a wasteful number, since it uses less digits than its factorization.

2554311661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164.

The product of its digits is 21600, while the sum is 34.

The square root of 2554311661 is about 50540.1984661715. The cubic root of 2554311661 is about 1366.9667848200.

The spelling of 2554311661 in words is "two billion, five hundred fifty-four million, three hundred eleven thousand, six hundred sixty-one".