1955259866 has 32 divisors (see below), whose sum is σ = 3649968000. Its totient is φ = 766487232.

The previous prime is 1955259853. The next prime is 1955259871. The reversal of 1955259866 is 6689525591.

It is a super-2 number, since 2×1955259866² = 7646082287180675912, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119021 + ... + 134448.

It is an arithmetic number, because the mean of its divisors is an integer number (114061500).

Almost surely, 2^1955259866 is an apocalyptic number.

1955259866 is a deficient number, since it is larger than the sum of its proper divisors (1694708134).

1955259866 is a wasteful number, since it uses less digits than its factorization.

1955259866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253526.

The product of its digits is 5832000, while the sum is 56.

The square root of 1955259866 is about 44218.3204791860. The cubic root of 1955259866 is about 1250.4552722416.

The spelling of 1955259866 in words is "one billion, nine hundred fifty-five million, two hundred fifty-nine thousand, eight hundred sixty-six".