985721671455 has 16 divisors (see below), whose sum is σ = 1577167110144. Its totient is φ = 525714079520.

The previous prime is 985721671453. The next prime is 985721671457. The reversal of 985721671455 is 554176127589.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (985721671453) and next prime (985721671457).

It is not a de Polignac number, because 985721671455 - 2¹ = 985721671453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985721671453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3175210 + ... + 3471800.

It is an arithmetic number, because the mean of its divisors is an integer number (98572944384).

Almost surely, 2^985721671455 is an apocalyptic number.

985721671455 is a deficient number, since it is larger than the sum of its proper divisors (591445438689).

985721671455 is a wasteful number, since it uses less digits than its factorization.

985721671455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518166.

The product of its digits is 21168000, while the sum is 60.

The spelling of 985721671455 in words is "nine hundred eighty-five billion, seven hundred twenty-one million, six hundred seventy-one thousand, four hundred fifty-five".