1951951951905 has 16 divisors (see below), whose sum is σ = 3123425969664. Its totient is φ = 1040940092160.

The previous prime is 1951951951793. The next prime is 1951951951931. The reversal of 1951951951905 is 5091591591591.

It is not a de Polignac number, because 1951951951905 - 2²¹ = 1951949854753 is a prime.

It is an unprimeable number.

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, 6149329 + ... + 6458958.

It is an arithmetic number, because the mean of its divisors is an integer number (195214123104).

Almost surely, 2^{1951951951905} is an apocalyptic number.

1951951951905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1951951951905 is a deficient number, since it is larger than the sum of its proper divisors (1171474017759).

1951951951905 is a wasteful number, since it uses less digits than its factorization.

1951951951905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12618616.

The product of its (nonzero) digits is 4100625, while the sum is 60.

The spelling of 1951951951905 in words is "one trillion, nine hundred fifty-one billion, nine hundred fifty-one million, nine hundred fifty-one thousand, nine hundred five".