3747525165221 has 4 divisors (see below), whose sum is σ = 3748364857152. Its totient is φ = 3746685473292.

The previous prime is 3747525165203. The next prime is 3747525165253. The reversal of 3747525165221 is 1225615257473.

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 3747525165221 - 2¹⁸ = 3747524903077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3747525165221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3747525165721) 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, 419839271 + ... + 419848196.

It is an arithmetic number, because the mean of its divisors is an integer number (937091214288).

Almost surely, 2^{3747525165221} is an apocalyptic number.

It is an amenable number.

3747525165221 is a deficient number, since it is larger than the sum of its proper divisors (839691931).

3747525165221 is an equidigital number, since it uses as much as digits as its factorization.

3747525165221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839691930.

The product of its digits is 3528000, while the sum is 50.

The spelling of 3747525165221 in words is "three trillion, seven hundred forty-seven billion, five hundred twenty-five million, one hundred sixty-five thousand, two hundred twenty-one".