1831720302545 has 32 divisors (see below), whose sum is σ = 2600942862336. Its totient is φ = 1211846961600.

The previous prime is 1831720302493. The next prime is 1831720302563. The reversal of 1831720302545 is 5452030271381.

It is a de Polignac number, because none of the positive numbers 2^k-1831720302545 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2191049 + ... + 2909318.

It is an arithmetic number, because the mean of its divisors is an integer number (81279464448).

Almost surely, 2^{1831720302545} is an apocalyptic number.

It is an amenable number.

1831720302545 is a deficient number, since it is larger than the sum of its proper divisors (769222559791).

1831720302545 is a wasteful number, since it uses less digits than its factorization.

1831720302545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5100741.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 1831720302545 in words is "one trillion, eight hundred thirty-one billion, seven hundred twenty million, three hundred two thousand, five hundred forty-five".