1661010511 has 2 divisors, whose sum is σ = 1661010512. Its totient is φ = 1661010510.

The previous prime is 1661010487. The next prime is 1661010523. The reversal of 1661010511 is 1150101661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661010511 - 2⁷ = 1661010383 is a prime.

It is a super-2 number, since 2×1661010511² = 5517911835304962242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661010581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830505255 + 830505256.

It is an arithmetic number, because the mean of its divisors is an integer number (830505256).

Almost surely, 2^1661010511 is an apocalyptic number.

1661010511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661010511 is an equidigital number, since it uses as much as digits as its factorization.

1661010511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The square root of 1661010511 is about 40755.4966967647. The cubic root of 1661010511 is about 1184.2883585820.

It can be divided in two parts, 1661010 and 511, that added together give a square (1661521 = 1289²).

The spelling of 1661010511 in words is "one billion, six hundred sixty-one million, ten thousand, five hundred eleven".