1081958661 has 48 divisors (see below), whose sum is σ = 1884046080. Its totient is φ = 611815680.

The previous prime is 1081958653. The next prime is 1081958677. The reversal of 1081958661 is 1668591801.

1081958661 is a `hidden beast` number, since 1 + 0 + 8 + 1 + 9 + 586 + 61 = 666.

It is not a de Polignac number, because 1081958661 - 2³ = 1081958653 is a prime.

It is a super-2 number, since 2×1081958661² = 2341269088225825842, 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 (1081958261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124116 + ... + 132546.

It is an arithmetic number, because the mean of its divisors is an integer number (39250960).

Almost surely, 2^1081958661 is an apocalyptic number.

It is an amenable number.

1081958661 is a deficient number, since it is larger than the sum of its proper divisors (802087419).

1081958661 is an equidigital number, since it uses as much as digits as its factorization.

1081958661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8551 (or 8538 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1081958661 is about 32893.1400294955. The cubic root of 1081958661 is about 1026.6054273619.

The spelling of 1081958661 in words is "one billion, eighty-one million, nine hundred fifty-eight thousand, six hundred sixty-one".