1051216661 has 12 divisors (see below), whose sum is σ = 1166701536. Its totient is φ = 946362120.

The previous prime is 1051216651. The next prime is 1051216693. The reversal of 1051216661 is 1666121501.

1051216661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1051216661 - 2⁶ = 1051216597 is a prime.

It is a super-2 number, since 2×1051216661² = 2210112936727977842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051216651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29711 + ... + 54636.

It is an arithmetic number, because the mean of its divisors is an integer number (97225128).

Almost surely, 2^1051216661 is an apocalyptic number.

1051216661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1051216661 is a deficient number, since it is larger than the sum of its proper divisors (115484875).

1051216661 is a wasteful number, since it uses less digits than its factorization.

1051216661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84472 (or 84461 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1051216661 is about 32422.4715436686. The cubic root of 1051216661 is about 1016.7887798260.

It can be divided in two parts, 1051 and 216661, that added together give a palindrome (217712).

The spelling of 1051216661 in words is "one billion, fifty-one million, two hundred sixteen thousand, six hundred sixty-one".