1155661460 has 24 divisors (see below), whose sum is σ = 2429770056. Its totient is φ = 461715840.

The previous prime is 1155661459. The next prime is 1155661469. The reversal of 1155661460 is 641665511.

It can be written as a sum of positive squares in 4 ways, for example, as 14032516 + 1141628944 = 3746^2 + 33788^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1155661460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155661469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16811 + ... + 50930.

It is an arithmetic number, because the mean of its divisors is an integer number (101240419).

Almost surely, 2^1155661460 is an apocalyptic number.

1155661460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155661460 is an abundant number, since it is smaller than the sum of its proper divisors (1274108596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155661460 is a wasteful number, since it uses less digits than its factorization.

1155661460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68603 (or 68601 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 1155661460 is about 33995.0211060385. The cubic root of 1155661460 is about 1049.4060011430.

The spelling of 1155661460 in words is "one billion, one hundred fifty-five million, six hundred sixty-one thousand, four hundred sixty".