3620541221645 has 4 divisors (see below), whose sum is σ = 4344649465980. Its totient is φ = 2896432977312.

The previous prime is 3620541221581. The next prime is 3620541221651. The reversal of 3620541221645 is 5461221450263.

3620541221645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2205005225476 + 1415535996169 = 1484926^2 + 1189763^2 .

It is a cyclic number.

It is not a de Polignac number, because 3620541221645 - 2⁶ = 3620541221581 is a prime.

It is a super-3 number, since 3×3620541221645³ (a number of 39 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362054122160 + ... + 362054122169.

It is an arithmetic number, because the mean of its divisors is an integer number (1086162366495).

Almost surely, 2^{3620541221645} is an apocalyptic number.

It is an amenable number.

3620541221645 is a deficient number, since it is larger than the sum of its proper divisors (724108244335).

3620541221645 is an equidigital number, since it uses as much as digits as its factorization.

3620541221645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724108244334.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 3620541221645 in words is "three trillion, six hundred twenty billion, five hundred forty-one million, two hundred twenty-one thousand, six hundred forty-five".