721435072149 has 20 divisors (see below), whose sum is σ = 1175671970880. Its totient is φ = 437233376520.

The previous prime is 721435072109. The next prime is 721435072177. The reversal of 721435072149 is 941270534127.

721435072149 is a `hidden beast` number, since 7 + 2 + 1 + 435 + 0 + 72 + 149 = 666.

It is not a de Polignac number, because 721435072149 - 2¹¹ = 721435070101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721435072109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 404844829 + ... + 404846610.

It is an arithmetic number, because the mean of its divisors is an integer number (58783598544).

Almost surely, 2^721435072149 is an apocalyptic number.

It is an amenable number.

721435072149 is a deficient number, since it is larger than the sum of its proper divisors (454236898731).

721435072149 is a wasteful number, since it uses less digits than its factorization.

721435072149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809691462 (or 809691453 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 721435072149 in words is "seven hundred twenty-one billion, four hundred thirty-five million, seventy-two thousand, one hundred forty-nine".