2177116651 has 2 divisors, whose sum is σ = 2177116652. Its totient is φ = 2177116650.

The previous prime is 2177116649. The next prime is 2177116661. The reversal of 2177116651 is 1566117712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2177116651 - 2¹ = 2177116649 is a prime.

It is a super-2 number, since 2×2177116651² = 9479673824122911602, which contains 22 as substring.

Together with 2177116649, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2177116651.

It is not a weakly prime, because it can be changed into another prime (2177116631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088558325 + 1088558326.

It is an arithmetic number, because the mean of its divisors is an integer number (1088558326).

Almost surely, 2^2177116651 is an apocalyptic number.

2177116651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177116651 is an equidigital number, since it uses as much as digits as its factorization.

2177116651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 37.

The square root of 2177116651 is about 46659.5826277947. The cubic root of 2177116651 is about 1296.0663441101.

It can be divided in two parts, 2177 and 116651, that added together give a triangular number (118828 = T₄₈₇).

The spelling of 2177116651 in words is "two billion, one hundred seventy-seven million, one hundred sixteen thousand, six hundred fifty-one".