720420251051 has 4 divisors (see below), whose sum is σ = 720423684192. Its totient is φ = 720416817912.

The previous prime is 720420251041. The next prime is 720420251071. The reversal of 720420251051 is 150152024027.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720420251051 - 2⁶ = 720420250987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720420251041) 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, 1379780 + ... + 1828833.

It is an arithmetic number, because the mean of its divisors is an integer number (180105921048).

Almost surely, 2^720420251051 is an apocalyptic number.

720420251051 is a deficient number, since it is larger than the sum of its proper divisors (3433141).

720420251051 is a wasteful number, since it uses less digits than its factorization.

720420251051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433140.

The product of its (nonzero) digits is 5600, while the sum is 29.

Adding to 720420251051 its reverse (150152024027), we get a palindrome (870572275078).

The spelling of 720420251051 in words is "seven hundred twenty billion, four hundred twenty million, two hundred fifty-one thousand, fifty-one".