3774514581721 has 81 divisors (see below), whose sum is σ = 4446439121271. Its totient is φ = 3202001207808.

The previous prime is 3774514581679. The next prime is 3774514581737. The reversal of 3774514581721 is 1271854154773.

The square root of 3774514581721 is 1942811.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 3535862791321 + 238651790400 = 1880389^2 + 488520^2 .

It is not a de Polignac number, because 3774514581721 - 2²³ = 3774506193113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3774514581751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 25332312555 + ... + 25332312703.

Almost surely, 2^{3774514581721} is an apocalyptic number.

3774514581721 is the 1942811-st square number.

3774514581721 is the 971406-th centered octagonal number.

It is an amenable number.

3774514581721 is a deficient number, since it is larger than the sum of its proper divisors (671924539550).

3774514581721 is an equidigital number, since it uses as much as digits as its factorization.

3774514581721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 238 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 55.

The spelling of 3774514581721 in words is "three trillion, seven hundred seventy-four billion, five hundred fourteen million, five hundred eighty-one thousand, seven hundred twenty-one".