1612919517905 has 4 divisors (see below), whose sum is σ = 1935503421492. Its totient is φ = 1290335614320.

The previous prime is 1612919517901. The next prime is 1612919517907. The reversal of 1612919517905 is 5097159192161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 977047240849 + 635872277056 = 988457^2 + 797416^2 .

It is not a de Polignac number, because 1612919517905 - 2² = 1612919517901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612919517901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161291951786 + ... + 161291951795.

It is an arithmetic number, because the mean of its divisors is an integer number (483875855373).

Almost surely, 2^{1612919517905} is an apocalyptic number.

It is an amenable number.

1612919517905 is a deficient number, since it is larger than the sum of its proper divisors (322583903587).

1612919517905 is an equidigital number, since it uses as much as digits as its factorization.

1612919517905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322583903586.

The product of its (nonzero) digits is 1530900, while the sum is 56.

The spelling of 1612919517905 in words is "one trillion, six hundred twelve billion, nine hundred nineteen million, five hundred seventeen thousand, nine hundred five".