1661063051 has 2 divisors, whose sum is σ = 1661063052. Its totient is φ = 1661063050.

The previous prime is 1661062993. The next prime is 1661063077. The reversal of 1661063051 is 1503601661.

It is a strong prime.

It is an emirp because it is prime and its reverse (1503601661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1661063051 - 2²² = 1656868747 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1661063351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830531525 + 830531526.

It is an arithmetic number, because the mean of its divisors is an integer number (830531526).

Almost surely, 2^1661063051 is an apocalyptic number.

1661063051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661063051 is an equidigital number, since it uses as much as digits as its factorization.

1661063051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1661063051 is about 40756.1412672986. The cubic root of 1661063051 is about 1184.3008453290.

The spelling of 1661063051 in words is "one billion, six hundred sixty-one million, sixty-three thousand, fifty-one".