2661989546 has 4 divisors (see below), whose sum is σ = 3992984322. Its totient is φ = 1330994772.

The previous prime is 2661989497. The next prime is 2661989563. The reversal of 2661989546 is 6459891662.

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

It can be written as a sum of positive squares in only one way, i.e., 2570997025 + 90992521 = 50705^2 + 9539^2 .

It is a super-2 number, since 2×2661989546² = 14172376686026572232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2661989491 and 2661989500.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665497385 + ... + 665497388.

Almost surely, 2^2661989546 is an apocalyptic number.

2661989546 is a deficient number, since it is larger than the sum of its proper divisors (1330994776).

2661989546 is a wasteful number, since it uses less digits than its factorization.

2661989546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330994775.

The product of its digits is 5598720, while the sum is 56.

The square root of 2661989546 is about 51594.4720488542. The cubic root of 2661989546 is about 1385.9113406651.

The spelling of 2661989546 in words is "two billion, six hundred sixty-one million, nine hundred eighty-nine thousand, five hundred forty-six".