1161215616 has 64 divisors (see below), whose sum is σ = 3364898400. Its totient is φ = 351882240.

The previous prime is 1161215597. The next prime is 1161215621. The reversal of 1161215616 is 6165121611.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133231 + ... + 141678.

Almost surely, 2^1161215616 is an apocalyptic number.

1161215616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1161215616 is an abundant number, since it is smaller than the sum of its proper divisors (2203682784).

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

1161215616 is a wasteful number, since it uses less digits than its factorization.

1161215616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274937 (or 274925 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 1161215616 is about 34076.6139162916. The cubic root of 1161215616 is about 1051.0844777128.

The spelling of 1161215616 in words is "one billion, one hundred sixty-one million, two hundred fifteen thousand, six hundred sixteen".