1521055061661 has 8 divisors (see below), whose sum is σ = 2075237913760. Its totient is φ = 990454458672.

The previous prime is 1521055061639. The next prime is 1521055061681. The reversal of 1521055061661 is 1661605501251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1521055061661 - 2¹⁴ = 1521055045277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521055061681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5895562126 + ... + 5895562383.

It is an arithmetic number, because the mean of its divisors is an integer number (259404739220).

Almost surely, 2^{1521055061661} is an apocalyptic number.

It is an amenable number.

1521055061661 is a deficient number, since it is larger than the sum of its proper divisors (554182852099).

1521055061661 is a wasteful number, since it uses less digits than its factorization.

1521055061661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11791124555.

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 1521055061661 in words is "one trillion, five hundred twenty-one billion, fifty-five million, sixty-one thousand, six hundred sixty-one".