721976745225 has 24 divisors (see below), whose sum is σ = 1196326778400. Its totient is φ = 384196664320.

The previous prime is 721976745223. The next prime is 721976745227. The reversal of 721976745225 is 522547679127.

It is an interprime number because it is at equal distance from previous prime (721976745223) and next prime (721976745227).

It is not a de Polignac number, because 721976745225 - 2¹ = 721976745223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721976745223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10686099 + ... + 10753448.

It is an arithmetic number, because the mean of its divisors is an integer number (49846949100).

Almost surely, 2^721976745225 is an apocalyptic number.

721976745225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721976745225 is a deficient number, since it is larger than the sum of its proper divisors (474350033175).

721976745225 is a wasteful number, since it uses less digits than its factorization.

721976745225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21440009 (or 21440004 counting only the distinct ones).

The product of its digits is 14817600, while the sum is 57.

The spelling of 721976745225 in words is "seven hundred twenty-one billion, nine hundred seventy-six million, seven hundred forty-five thousand, two hundred twenty-five".