3771366721 has 4 divisors (see below), whose sum is σ = 3893023744. Its totient is φ = 3649709700.

The previous prime is 3771366719. The next prime is 3771366757. The reversal of 3771366721 is 1276631773.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1276631773 = 43 ⋅29689111.

It is a cyclic number.

It is not a de Polignac number, because 3771366721 - 2¹ = 3771366719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3771366761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60828465 + ... + 60828526.

It is an arithmetic number, because the mean of its divisors is an integer number (973255936).

Almost surely, 2^3771366721 is an apocalyptic number.

3771366721 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3771366721 is a deficient number, since it is larger than the sum of its proper divisors (121657023).

3771366721 is a wasteful number, since it uses less digits than its factorization.

3771366721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121657022.

The product of its digits is 222264, while the sum is 43.

The square root of 3771366721 is about 61411.4543143215. The cubic root of 3771366721 is about 1556.5613939959.

The spelling of 3771366721 in words is "three billion, seven hundred seventy-one million, three hundred sixty-six thousand, seven hundred twenty-one".