116557561 has 8 divisors (see below), whose sum is σ = 117884160. Its totient is φ = 115235568.

The previous prime is 116557523. The next prime is 116557577. The reversal of 116557561 is 165755611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 116557561 - 2²³ = 108168953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 116557561.

It is not an unprimeable number, because it can be changed into a prime (116557501) 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, 80280 + ... + 81718.

It is an arithmetic number, because the mean of its divisors is an integer number (14735520).

Almost surely, 2^116557561 is an apocalyptic number.

It is an amenable number.

116557561 is a deficient number, since it is larger than the sum of its proper divisors (1326599).

116557561 is a wasteful number, since it uses less digits than its factorization.

116557561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303.

The product of its digits is 31500, while the sum is 37.

The square root of 116557561 is about 10796.1827050120. The cubic root of 116557561 is about 488.4800338398.

The spelling of 116557561 in words is "one hundred sixteen million, five hundred fifty-seven thousand, five hundred sixty-one".