720261611 has 4 divisors (see below), whose sum is σ = 720337800. Its totient is φ = 720185424.

The previous prime is 720261601. The next prime is 720261623. The reversal of 720261611 is 116162027.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 116162027 = 167 ⋅695581.

It is a cyclic number.

It is not a de Polignac number, because 720261611 - 2⁶ = 720261547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720261601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21506 + ... + 43623.

It is an arithmetic number, because the mean of its divisors is an integer number (180084450).

Almost surely, 2^720261611 is an apocalyptic number.

720261611 is a deficient number, since it is larger than the sum of its proper divisors (76189).

720261611 is a wasteful number, since it uses less digits than its factorization.

720261611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76188.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 720261611 is about 26837.6901204258. The cubic root of 720261611 is about 896.3894903125.

It can be divided in two parts, 72026 and 1611, that added together give a palindrome (73637).

The spelling of 720261611 in words is "seven hundred twenty million, two hundred sixty-one thousand, six hundred eleven".