3662670721 has 4 divisors (see below), whose sum is σ = 3664869552. Its totient is φ = 3660471892.

The previous prime is 3662670707. The next prime is 3662670749. The reversal of 3662670721 is 1270762663.

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.

It is a cyclic number.

It is not a de Polignac number, because 3662670721 - 2⁷ = 3662670593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3662670701) 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, 1096915 + ... + 1100248.

It is an arithmetic number, because the mean of its divisors is an integer number (916217388).

Almost surely, 2^3662670721 is an apocalyptic number.

It is an amenable number.

3662670721 is a deficient number, since it is larger than the sum of its proper divisors (2198831).

3662670721 is a wasteful number, since it uses less digits than its factorization.

3662670721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198830.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 3662670721 is about 60520.0026520158. The cubic root of 3662670721 is about 1541.4612993129.

The spelling of 3662670721 in words is "three billion, six hundred sixty-two million, six hundred seventy thousand, seven hundred twenty-one".