1061651661 has 8 divisors (see below), whose sum is σ = 1617754944. Its totient is φ = 606658080.

The previous prime is 1061651627. The next prime is 1061651737. The reversal of 1061651661 is 1661561601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1061651661 - 2¹⁸ = 1061389517 is a prime.

It is a super-2 number, since 2×1061651661² = 2254208498608117842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1061601661) 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 in 7 ways as a sum of consecutive naturals, for example, 25277400 + ... + 25277441.

It is an arithmetic number, because the mean of its divisors is an integer number (202219368).

Almost surely, 2^1061651661 is an apocalyptic number.

It is an amenable number.

1061651661 is a deficient number, since it is larger than the sum of its proper divisors (556103283).

1061651661 is an equidigital number, since it uses as much as digits as its factorization.

1061651661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50554851.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1061651661 is about 32582.9965012428. The cubic root of 1061651661 is about 1020.1421245633.

The spelling of 1061651661 in words is "one billion, sixty-one million, six hundred fifty-one thousand, six hundred sixty-one".