3661772521 has 8 divisors (see below), whose sum is σ = 3995131104. Its totient is φ = 3328492320.

The previous prime is 3661772497. The next prime is 3661772563. The reversal of 3661772521 is 1252771663.

3661772521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3661772521 - 2⁷ = 3661772393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661772591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123666 + ... + 150388.

It is an arithmetic number, because the mean of its divisors is an integer number (499391388).

Almost surely, 2^3661772521 is an apocalyptic number.

It is an amenable number.

3661772521 is a deficient number, since it is larger than the sum of its proper divisors (333358583).

3661772521 is a wasteful number, since it uses less digits than its factorization.

3661772521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39191.

The product of its digits is 105840, while the sum is 40.

The square root of 3661772521 is about 60512.5815099637. The cubic root of 3661772521 is about 1541.3352843694.

The spelling of 3661772521 in words is "three billion, six hundred sixty-one million, seven hundred seventy-two thousand, five hundred twenty-one".