2661351166042 has 4 divisors (see below), whose sum is σ = 3992026749066. Its totient is φ = 1330675583020.

The previous prime is 2661351166039. The next prime is 2661351166073. The reversal of 2661351166042 is 2406611531662.

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., 2661110326681 + 240839361 = 1631291^2 + 15519^2 .

It is a super-2 number, since 2×2661351166042² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2661351166042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665337791509 + ... + 665337791512.

Almost surely, 2^{2661351166042} is an apocalyptic number.

2661351166042 is a deficient number, since it is larger than the sum of its proper divisors (1330675583024).

2661351166042 is a wasteful number, since it uses less digits than its factorization.

2661351166042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330675583023.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 2661351166042 in words is "two trillion, six hundred sixty-one billion, three hundred fifty-one million, one hundred sixty-six thousand, forty-two".