2661776042 has 4 divisors (see below), whose sum is σ = 3992664066. Its totient is φ = 1330888020.

The previous prime is 2661776023. The next prime is 2661776069. The reversal of 2661776042 is 2406771662.

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., 1431941281 + 1229834761 = 37841^2 + 35069^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665444009 + ... + 665444012.

Almost surely, 2^2661776042 is an apocalyptic number.

2661776042 is a deficient number, since it is larger than the sum of its proper divisors (1330888024).

2661776042 is a wasteful number, since it uses less digits than its factorization.

2661776042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330888023.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 2661776042 is about 51592.4029484962. The cubic root of 2661776042 is about 1385.8742874860.

The spelling of 2661776042 in words is "two billion, six hundred sixty-one million, seven hundred seventy-six thousand, forty-two".