4720721545 has 4 divisors (see below), whose sum is σ = 5664865860. Its totient is φ = 3776577232.

The previous prime is 4720721531. The next prime is 4720721569. The reversal of 4720721545 is 5451270274.

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 1682066169 + 3038655376 = 41013^2 + 55124^2 .

It is a cyclic number.

It is not a de Polignac number, because 4720721545 - 2²⁵ = 4687167113 is a prime.

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, 472072150 + ... + 472072159.

It is an arithmetic number, because the mean of its divisors is an integer number (1416216465).

Almost surely, 2^4720721545 is an apocalyptic number.

It is an amenable number.

4720721545 is a deficient number, since it is larger than the sum of its proper divisors (944144315).

4720721545 is an equidigital number, since it uses as much as digits as its factorization.

4720721545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944144314.

The product of its (nonzero) digits is 78400, while the sum is 37.

The square root of 4720721545 is about 68707.5071953568. The cubic root of 4720721545 is about 1677.5267776018.

The spelling of 4720721545 in words is "four billion, seven hundred twenty million, seven hundred twenty-one thousand, five hundred forty-five".