721870707055 has 4 divisors (see below), whose sum is σ = 866244848472. Its totient is φ = 577496565640.

The previous prime is 721870707049. The next prime is 721870707067. The reversal of 721870707055 is 550707078127.

721870707055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 721870707055 - 2⁷ = 721870706927 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 72187070701 + ... + 72187070710.

It is an arithmetic number, because the mean of its divisors is an integer number (216561212118).

Almost surely, 2^721870707055 is an apocalyptic number.

721870707055 is a deficient number, since it is larger than the sum of its proper divisors (144374141417).

721870707055 is a wasteful number, since it uses less digits than its factorization.

721870707055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144374141416.

The product of its (nonzero) digits is 960400, while the sum is 49.

The spelling of 721870707055 in words is "seven hundred twenty-one billion, eight hundred seventy million, seven hundred seven thousand, fifty-five".