1661025151 has 2 divisors, whose sum is σ = 1661025152. Its totient is φ = 1661025150.

The previous prime is 1661025143. The next prime is 1661025161. The reversal of 1661025151 is 1515201661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1515201661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661025151 - 2³ = 1661025143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661025101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830512575 + 830512576.

It is an arithmetic number, because the mean of its divisors is an integer number (830512576).

Almost surely, 2^1661025151 is an apocalyptic number.

1661025151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661025151 is an equidigital number, since it uses as much as digits as its factorization.

1661025151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1661025151 is about 40755.6763040438. The cubic root of 1661025151 is about 1184.2918379761.

The spelling of 1661025151 in words is "one billion, six hundred sixty-one million, twenty-five thousand, one hundred fifty-one".