1156661550 has 72 divisors (see below), whose sum is σ = 3390084360. Its totient is φ = 280401600.

The previous prime is 1156661531. The next prime is 1156661557. The reversal of 1156661550 is 551666511.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156661557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 111885 + ... + 121784.

It is an arithmetic number, because the mean of its divisors is an integer number (47084505).

Almost surely, 2^1156661550 is an apocalyptic number.

1156661550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1156661550 is an abundant number, since it is smaller than the sum of its proper divisors (2233422810).

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

1156661550 is a wasteful number, since it uses less digits than its factorization.

1156661550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233698 (or 233690 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1156661550 is about 34009.7272849989. The cubic root of 1156661550 is about 1049.7086266348.

The spelling of 1156661550 in words is "one billion, one hundred fifty-six million, six hundred sixty-one thousand, five hundred fifty".