3660121971261 has 24 divisors (see below), whose sum is σ = 6042160510464. Its totient is φ = 2091479438880.

The previous prime is 3660121971161. The next prime is 3660121971283. The reversal of 3660121971261 is 1621791210663.

3660121971261 is a `hidden beast` number, since 3 + 6 + 601 + 2 + 19 + 7 + 1 + 26 + 1 = 666.

It is not a de Polignac number, because 3660121971261 - 2¹¹ = 3660121969213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660121971161) 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, 9900435 + ... + 10263471.

It is an arithmetic number, because the mean of its divisors is an integer number (251756687936).

Almost surely, 2^{3660121971261} is an apocalyptic number.

It is an amenable number.

3660121971261 is a deficient number, since it is larger than the sum of its proper divisors (2382038539203).

3660121971261 is a wasteful number, since it uses less digits than its factorization.

3660121971261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523081 (or 523078 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 3660121971261 in words is "three trillion, six hundred sixty billion, one hundred twenty-one million, nine hundred seventy-one thousand, two hundred sixty-one".