721145421307608 has 32 divisors (see below), whose sum is σ = 1966760239930560. Its totient is φ = 218528915547680.

The previous prime is 721145421307471. The next prime is 721145421307609. The reversal of 721145421307608 is 806703124541127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721145421307609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1365805721910 + ... + 1365805722437.

It is an arithmetic number, because the mean of its divisors is an integer number (61461257497830).

Almost surely, 2^{721145421307608} is an apocalyptic number.

It is an amenable number.

721145421307608 is an abundant number, since it is smaller than the sum of its proper divisors (1245614818622952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721145421307608 is a wasteful number, since it uses less digits than its factorization.

721145421307608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731611444367 (or 2731611444363 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 721145421307608 in words is "seven hundred twenty-one trillion, one hundred forty-five billion, four hundred twenty-one million, three hundred seven thousand, six hundred eight".