2661320554 has 8 divisors (see below), whose sum is σ = 3998624868. Its totient is φ = 1328445600.

The previous prime is 2661320551. The next prime is 2661320567. The reversal of 2661320554 is 4550231662.

It can be written as a sum of positive squares in 2 ways, for example, as 2557830625 + 103489929 = 50575^2 + 10173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2661320554² = 14165254182285733832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2661320551) 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, 1105837 + ... + 1108240.

Almost surely, 2^2661320554 is an apocalyptic number.

2661320554 is a deficient number, since it is larger than the sum of its proper divisors (1337304314).

2661320554 is a wasteful number, since it uses less digits than its factorization.

2661320554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214680.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 2661320554 is about 51587.9884663087. The cubic root of 2661320554 is about 1385.7952318595.

The spelling of 2661320554 in words is "two billion, six hundred sixty-one million, three hundred twenty thousand, five hundred fifty-four".