661362100187 has 2 divisors, whose sum is σ = 661362100188. Its totient is φ = 661362100186.

The previous prime is 661362100109. The next prime is 661362100211. The reversal of 661362100187 is 781001263166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661362100187 - 2¹⁰ = 661362099163 is a prime.

It is not a weakly prime, because it can be changed into another prime (661362100687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330681050093 + 330681050094.

It is an arithmetic number, because the mean of its divisors is an integer number (330681050094).

Almost surely, 2^661362100187 is an apocalyptic number.

661362100187 is a deficient number, since it is larger than the sum of its proper divisors (1).

661362100187 is an equidigital number, since it uses as much as digits as its factorization.

661362100187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 661362100187 in words is "six hundred sixty-one billion, three hundred sixty-two million, one hundred thousand, one hundred eighty-seven".