1156665986 has 48 divisors (see below), whose sum is σ = 2120501760. Its totient is φ = 463034880.

The previous prime is 1156665953. The next prime is 1156666019. The reversal of 1156665986 is 6895666511.

It is an interprime number because it is at equal distance from previous prime (1156665953) and next prime (1156666019).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 363410 + ... + 366578.

It is an arithmetic number, because the mean of its divisors is an integer number (44177120).

Almost surely, 2^1156665986 is an apocalyptic number.

1156665986 is a deficient number, since it is larger than the sum of its proper divisors (963835774).

1156665986 is a wasteful number, since it uses less digits than its factorization.

1156665986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267 (or 3238 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 53.

The square root of 1156665986 is about 34009.7925015722. The cubic root of 1156665986 is about 1049.7099685720.

The spelling of 1156665986 in words is "one billion, one hundred fifty-six million, six hundred sixty-five thousand, nine hundred eighty-six".