188640374287 has 2 divisors, whose sum is σ = 188640374288. Its totient is φ = 188640374286.

The previous prime is 188640374243. The next prime is 188640374317. The reversal of 188640374287 is 782473046881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 188640374287 - 2²³ = 188631985679 is a prime.

It is a super-2 number, since 2×188640374287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188640374207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94320187143 + 94320187144.

It is an arithmetic number, because the mean of its divisors is an integer number (94320187144).

Almost surely, 2^188640374287 is an apocalyptic number.

188640374287 is a deficient number, since it is larger than the sum of its proper divisors (1).

188640374287 is an equidigital number, since it uses as much as digits as its factorization.

188640374287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14450688, while the sum is 58.

The spelling of 188640374287 in words is "one hundred eighty-eight billion, six hundred forty million, three hundred seventy-four thousand, two hundred eighty-seven".