2081661377 has 8 divisors (see below), whose sum is σ = 2158041600. Its totient is φ = 2005858080.

The previous prime is 2081661341. The next prime is 2081661397. The reversal of 2081661377 is 7731661802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2081661377 is a prime.

It is a super-2 number, since 2×2081661377² = 8666628176987072258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081661397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136877 + ... + 151322.

It is an arithmetic number, because the mean of its divisors is an integer number (269755200).

Almost surely, 2^2081661377 is an apocalyptic number.

It is an amenable number.

2081661377 is a deficient number, since it is larger than the sum of its proper divisors (76380223).

2081661377 is a wasteful number, since it uses less digits than its factorization.

2081661377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288463.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 2081661377 is about 45625.2274186113. The cubic root of 2081661377 is about 1276.8406329735.

The spelling of 2081661377 in words is "two billion, eighty-one million, six hundred sixty-one thousand, three hundred seventy-seven".