1995027661 has 16 divisors (see below), whose sum is σ = 2258436096. Its totient is φ = 1745910000.

The previous prime is 1995027641. The next prime is 1995027677. The reversal of 1995027661 is 1667205991.

It is a cyclic number.

It is not a de Polignac number, because 1995027661 - 2¹⁹ = 1994503373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995027641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49816 + ... + 80446.

It is an arithmetic number, because the mean of its divisors is an integer number (141152256).

Almost surely, 2^1995027661 is an apocalyptic number.

1995027661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1995027661 is a deficient number, since it is larger than the sum of its proper divisors (263408435).

1995027661 is a wasteful number, since it uses less digits than its factorization.

1995027661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30864.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 1995027661 is about 44665.7325138635. The cubic root of 1995027661 is about 1258.8760576443.

The spelling of 1995027661 in words is "one billion, nine hundred ninety-five million, twenty-seven thousand, six hundred sixty-one".