100605661591 has 2 divisors, whose sum is σ = 100605661592. Its totient is φ = 100605661590.

The previous prime is 100605661567. The next prime is 100605661609. The reversal of 100605661591 is 195166506001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100605661591 - 2⁷ = 100605661463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100605661511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50302830795 + 50302830796.

It is an arithmetic number, because the mean of its divisors is an integer number (50302830796).

Almost surely, 2^100605661591 is an apocalyptic number.

100605661591 is a deficient number, since it is larger than the sum of its proper divisors (1).

100605661591 is an equidigital number, since it uses as much as digits as its factorization.

100605661591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 100605661591 in words is "one hundred billion, six hundred five million, six hundred sixty-one thousand, five hundred ninety-one".