1571645049949 has 8 divisors (see below), whose sum is σ = 1692741740760. Its totient is φ = 1450577061696.

The previous prime is 1571645049893. The next prime is 1571645049967. The reversal of 1571645049949 is 9499405461751.

It can be written as a sum of positive squares in 4 ways, for example, as 40770878724 + 1530874171225 = 201918^2 + 1237285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1571645049949 - 2²¹ = 1571642952797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1571645049049) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7061842 + ... + 7280995.

It is an arithmetic number, because the mean of its divisors is an integer number (211592717595).

Almost surely, 2^{1571645049949} is an apocalyptic number.

It is an amenable number.

1571645049949 is a deficient number, since it is larger than the sum of its proper divisors (121096690811).

1571645049949 is a wasteful number, since it uses less digits than its factorization.

1571645049949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14351279.

The product of its (nonzero) digits is 48988800, while the sum is 64.

The spelling of 1571645049949 in words is "one trillion, five hundred seventy-one billion, six hundred forty-five million, forty-nine thousand, nine hundred forty-nine".