1012265661 has 16 divisors (see below), whose sum is σ = 1519884288. Its totient is φ = 593703600.

The previous prime is 1012265633. The next prime is 1012265701. The reversal of 1012265661 is 1665622101.

It is not a de Polignac number, because 1012265661 - 2¹¹ = 1012263613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012265161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493731 + ... + 495776.

It is an arithmetic number, because the mean of its divisors is an integer number (94992768).

Almost surely, 2^1012265661 is an apocalyptic number.

1012265661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1012265661 is a deficient number, since it is larger than the sum of its proper divisors (507618627).

1012265661 is a wasteful number, since it uses less digits than its factorization.

1012265661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989552.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1012265661 is about 31816.1226581744. The cubic root of 1012265661 is about 1004.0719503814.

Adding to 1012265661 its reverse (1665622101), we get a palindrome (2677887762).

The spelling of 1012265661 in words is "one billion, twelve million, two hundred sixty-five thousand, six hundred sixty-one".