1512201011661 has 12 divisors (see below), whose sum is σ = 2188211884092. Its totient is φ = 1006324069056.

The previous prime is 1512201011593. The next prime is 1512201011669. The reversal of 1512201011661 is 1661101022151.

1512201011661 is a `hidden beast` number, since 1 + 512 + 20 + 10 + 116 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 684228406761 + 827972604900 = 827181^2 + 909930^2 .

It is not a de Polignac number, because 1512201011661 - 2¹⁸ = 1512200749517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1512201011669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150822936 + ... + 150832961.

It is an arithmetic number, because the mean of its divisors is an integer number (182350990341).

Almost surely, 2^{1512201011661} is an apocalyptic number.

It is an amenable number.

1512201011661 is a deficient number, since it is larger than the sum of its proper divisors (676010872431).

1512201011661 is a wasteful number, since it uses less digits than its factorization.

1512201011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301656460 (or 301656457 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The spelling of 1512201011661 in words is "one trillion, five hundred twelve billion, two hundred one million, eleven thousand, six hundred sixty-one".