1972905072505 has 4 divisors (see below), whose sum is σ = 2367486087012. Its totient is φ = 1578324058000.

The previous prime is 1972905072491. The next prime is 1972905072563. The reversal of 1972905072505 is 5052705092791.

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 398803617081 + 1574101455424 = 631509^2 + 1254632^2 .

It is not a de Polignac number, because 1972905072505 - 2⁵ = 1972905072473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197290507246 + ... + 197290507255.

It is an arithmetic number, because the mean of its divisors is an integer number (591871521753).

Almost surely, 2^{1972905072505} is an apocalyptic number.

It is an amenable number.

1972905072505 is a deficient number, since it is larger than the sum of its proper divisors (394581014507).

1972905072505 is an equidigital number, since it uses as much as digits as its factorization.

1972905072505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394581014506.

The product of its (nonzero) digits is 1984500, while the sum is 52.

The spelling of 1972905072505 in words is "one trillion, nine hundred seventy-two billion, nine hundred five million, seventy-two thousand, five hundred five".