721857414719 has 4 divisors (see below), whose sum is σ = 824979902544. Its totient is φ = 618734926896.

The previous prime is 721857414679. The next prime is 721857414781. The reversal of 721857414719 is 917414758127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 721857414719 - 2³⁶ = 653137937983 is a prime.

It is a super-2 number, since 2×721857414719² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721857414799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51561243902 + ... + 51561243915.

It is an arithmetic number, because the mean of its divisors is an integer number (206244975636).

Almost surely, 2^721857414719 is an apocalyptic number.

721857414719 is a deficient number, since it is larger than the sum of its proper divisors (103122487825).

721857414719 is a wasteful number, since it uses less digits than its factorization.

721857414719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103122487824.

The product of its digits is 3951360, while the sum is 56.

The spelling of 721857414719 in words is "seven hundred twenty-one billion, eight hundred fifty-seven million, four hundred fourteen thousand, seven hundred nineteen".