2061691351905 has 16 divisors (see below), whose sum is σ = 3347940585024. Its totient is φ = 1083157247040.

The previous prime is 2061691351897. The next prime is 2061691351919. The reversal of 2061691351905 is 5091531961602.

It is not a de Polignac number, because 2061691351905 - 2³ = 2061691351897 is a prime.

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, 1025716086 + ... + 1025718095.

It is an arithmetic number, because the mean of its divisors is an integer number (209246286564).

Almost surely, 2^{2061691351905} is an apocalyptic number.

It is an amenable number.

2061691351905 is a deficient number, since it is larger than the sum of its proper divisors (1286249233119).

2061691351905 is a wasteful number, since it uses less digits than its factorization.

2061691351905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051434256.

The product of its (nonzero) digits is 437400, while the sum is 48.

The spelling of 2061691351905 in words is "two trillion, sixty-one billion, six hundred ninety-one million, three hundred fifty-one thousand, nine hundred five".