721538677419 has 24 divisors (see below), whose sum is σ = 1119162756240. Its totient is φ = 412292510784.

The previous prime is 721538677411. The next prime is 721538677459. The reversal of 721538677419 is 914776835127.

It is not a de Polignac number, because 721538677419 - 2³ = 721538677411 is a prime.

It is a super-2 number, since 2×721538677419² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (721538677411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4757077 + ... + 4906409.

It is an arithmetic number, because the mean of its divisors is an integer number (46631781510).

Almost surely, 2^721538677419 is an apocalyptic number.

721538677419 is a deficient number, since it is larger than the sum of its proper divisors (397624078821).

721538677419 is a wasteful number, since it uses less digits than its factorization.

721538677419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182219 (or 182212 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 60.

The spelling of 721538677419 in words is "seven hundred twenty-one billion, five hundred thirty-eight million, six hundred seventy-seven thousand, four hundred nineteen".