1661062500525 has 24 divisors (see below), whose sum is σ = 2813272689024. Its totient is φ = 864292681600.

The previous prime is 1661062500523. The next prime is 1661062500529. The reversal of 1661062500525 is 5250052601661.

It is a happy number.

It is not a de Polignac number, because 1661062500525 - 2¹ = 1661062500523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661062500523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270088389 + ... + 270094538.

It is an arithmetic number, because the mean of its divisors is an integer number (117219695376).

Almost surely, 2^{1661062500525} is an apocalyptic number.

1661062500525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1661062500525 is a deficient number, since it is larger than the sum of its proper divisors (1152210188499).

1661062500525 is a wasteful number, since it uses less digits than its factorization.

1661062500525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540182981 (or 540182976 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 1661062500525 in words is "one trillion, six hundred sixty-one billion, sixty-two million, five hundred thousand, five hundred twenty-five".