1661350051 has 2 divisors, whose sum is σ = 1661350052. Its totient is φ = 1661350050.

The previous prime is 1661350049. The next prime is 1661350241. The reversal of 1661350051 is 1500531661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1661350051 - 2¹ = 1661350049 is a prime.

Together with 1661350049, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1661350001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830675025 + 830675026.

It is an arithmetic number, because the mean of its divisors is an integer number (830675026).

Almost surely, 2^1661350051 is an apocalyptic number.

1661350051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661350051 is an equidigital number, since it uses as much as digits as its factorization.

1661350051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1661350051 is about 40759.6620569896. The cubic root of 1661350051 is about 1184.3690495971.

The spelling of 1661350051 in words is "one billion, six hundred sixty-one million, three hundred fifty thousand, fifty-one".