215854477152 has 96 divisors (see below), whose sum is σ = 577554600672. Its totient is φ = 70563876864.

The previous prime is 215854477151. The next prime is 215854477159. The reversal of 215854477152 is 251774458512.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×215854477152² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215854477095 and 215854477104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215854477151) 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, 14121738 + ... + 14137014.

It is an arithmetic number, because the mean of its divisors is an integer number (6016193757).

Almost surely, 2^215854477152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215854477152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288777300336).

215854477152 is an abundant number, since it is smaller than the sum of its proper divisors (361700123520).

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

215854477152 is a wasteful number, since it uses less digits than its factorization.

215854477152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18120 (or 18112 counting only the distinct ones).

The product of its digits is 3136000, while the sum is 51.

The spelling of 215854477152 in words is "two hundred fifteen billion, eight hundred fifty-four million, four hundred seventy-seven thousand, one hundred fifty-two".