721450251122551 has 16 divisors (see below), whose sum is σ = 753648879277440. Its totient is φ = 690101106439680.

The previous prime is 721450251122483. The next prime is 721450251122581. The reversal of 721450251122551 is 155221152054127.

It is a cyclic number.

It is not a de Polignac number, because 721450251122551 - 2⁷ = 721450251122423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721450251122498 and 721450251122507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721450251122581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 800949346 + ... + 801849583.

It is an arithmetic number, because the mean of its divisors is an integer number (47103054954840).

Almost surely, 2^{721450251122551} is an apocalyptic number.

721450251122551 is a deficient number, since it is larger than the sum of its proper divisors (32198628154889).

721450251122551 is a wasteful number, since it uses less digits than its factorization.

721450251122551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602799194.

The product of its (nonzero) digits is 280000, while the sum is 43.

The spelling of 721450251122551 in words is "seven hundred twenty-one trillion, four hundred fifty billion, two hundred fifty-one million, one hundred twenty-two thousand, five hundred fifty-one".