2077781018 has 16 divisors (see below), whose sum is σ = 3149652264. Its totient is φ = 1027952640.

The previous prime is 2077781003. The next prime is 2077781023. The reversal of 2077781018 is 8101877702.

It can be written as a sum of positive squares in 4 ways, for example, as 1310657209 + 767123809 = 36203^2 + 27697^2 .

It is a super-2 number, since 2×2077781018² = 8634347917522232648, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61946 + ... + 89402.

Almost surely, 2^2077781018 is an apocalyptic number.

2077781018 is a deficient number, since it is larger than the sum of its proper divisors (1071871246).

2077781018 is a wasteful number, since it uses less digits than its factorization.

2077781018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27857.

The product of its (nonzero) digits is 43904, while the sum is 41.

The square root of 2077781018 is about 45582.6833128547. The cubic root of 2077781018 is about 1276.0467667761.

The spelling of 2077781018 in words is "two billion, seventy-seven million, seven hundred eighty-one thousand, eighteen".