2545746721 has 8 divisors (see below), whose sum is σ = 2964320064. Its totient is φ = 2140897200.

The previous prime is 2545746659. The next prime is 2545746761. The reversal of 2545746721 is 1276475452.

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 2545746721 - 2¹³ = 2545738529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2545746761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3430555 + ... + 3431296.

It is an arithmetic number, because the mean of its divisors is an integer number (370540008).

Almost surely, 2^2545746721 is an apocalyptic number.

It is an amenable number.

2545746721 is a deficient number, since it is larger than the sum of its proper divisors (418573343).

2545746721 is an equidigital number, since it uses as much as digits as its factorization.

2545746721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6861911.

The product of its digits is 470400, while the sum is 43.

The square root of 2545746721 is about 50455.3933787063. The cubic root of 2545746721 is about 1365.4372013002.

The spelling of 2545746721 in words is "two billion, five hundred forty-five million, seven hundred forty-six thousand, seven hundred twenty-one".