3621403800261 has 24 divisors (see below), whose sum is σ = 5633382245400. Its totient is φ = 2228521591296.

The previous prime is 3621403800229. The next prime is 3621403800281. The reversal of 3621403800261 is 1620083041263.

3621403800261 is a `hidden beast` number, since 3 + 6 + 2 + 14 + 0 + 380 + 0 + 261 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 73338056100 + 3548065744161 = 270810^2 + 1883631^2 .

It is not a de Polignac number, because 3621403800261 - 2⁵ = 3621403800229 is a prime.

It is a super-2 number, since 2×3621403800261² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621403800281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8766025 + ... + 9169841.

It is an arithmetic number, because the mean of its divisors is an integer number (234724260225).

Almost surely, 2^{3621403800261} is an apocalyptic number.

It is an amenable number.

3621403800261 is a deficient number, since it is larger than the sum of its proper divisors (2011978445139).

3621403800261 is a wasteful number, since it uses less digits than its factorization.

3621403800261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480485 (or 480482 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 3621403800261 in words is "three trillion, six hundred twenty-one billion, four hundred three million, eight hundred thousand, two hundred sixty-one".