215044570464 has 96 divisors (see below), whose sum is σ = 584126212320. Its totient is φ = 69189722112.

The previous prime is 215044570441. The next prime is 215044570469. The reversal of 215044570464 is 464075440512.

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

It is a super-2 number, since 2×215044570464² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215044570469) 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, 11886994 + ... + 11905070.

It is an arithmetic number, because the mean of its divisors is an integer number (6084648045).

Almost surely, 2^215044570464 is an apocalyptic number.

215044570464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215044570464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292063106160).

215044570464 is an abundant number, since it is smaller than the sum of its proper divisors (369081641856).

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

215044570464 is a wasteful number, since it uses less digits than its factorization.

215044570464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22392 (or 22384 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 42.

The spelling of 215044570464 in words is "two hundred fifteen billion, forty-four million, five hundred seventy thousand, four hundred sixty-four".