1188861657985 has 8 divisors (see below), whose sum is σ = 1510553636136. Its totient is φ = 895142895360.

The previous prime is 1188861657979. The next prime is 1188861658073. The reversal of 1188861657985 is 5897561688811.

It can be written as a sum of positive squares in 4 ways, for example, as 398681113744 + 790180544241 = 631412^2 + 888921^2 .

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

It is not a de Polignac number, because 1188861657985 - 2²³ = 1188853269377 is a prime.

It is a super-2 number, since 2×1188861657985² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

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, 6993303786 + ... + 6993303955.

It is an arithmetic number, because the mean of its divisors is an integer number (188819204517).

Almost surely, 2^{1188861657985} is an apocalyptic number.

It is an amenable number.

1188861657985 is a deficient number, since it is larger than the sum of its proper divisors (321691978151).

1188861657985 is a wasteful number, since it uses less digits than its factorization.

1188861657985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13986607763.

The product of its digits is 232243200, while the sum is 73.

The spelling of 1188861657985 in words is "one trillion, one hundred eighty-eight billion, eight hundred sixty-one million, six hundred fifty-seven thousand, nine hundred eighty-five".