187423578061 has 2 divisors, whose sum is σ = 187423578062. Its totient is φ = 187423578060.

The previous prime is 187423578059. The next prime is 187423578101. The reversal of 187423578061 is 160875324781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168128701225 + 19294876836 = 410035^2 + 138906^2 .

It is an emirp because it is prime and its reverse (160875324781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 187423578061 - 2¹ = 187423578059 is a prime.

It is a super-2 number, since 2×187423578061² (a number of 23 digits) contains 22 as substring.

Together with 187423578059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187423578031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93711789030 + 93711789031.

It is an arithmetic number, because the mean of its divisors is an integer number (93711789031).

Almost surely, 2^187423578061 is an apocalyptic number.

It is an amenable number.

187423578061 is a deficient number, since it is larger than the sum of its proper divisors (1).

187423578061 is an equidigital number, since it uses as much as digits as its factorization.

187423578061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 187423578061 in words is "one hundred eighty-seven billion, four hundred twenty-three million, five hundred seventy-eight thousand, sixty-one".