215640013532 has 12 divisors (see below), whose sum is σ = 380832134760. Its totient is φ = 106830832176.

The previous prime is 215640013513. The next prime is 215640013579. The reversal of 215640013532 is 235310046512.

It is a happy number.

It is a super-2 number, since 2×215640013532² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247293158 + ... + 247294029.

It is an arithmetic number, because the mean of its divisors is an integer number (31736011230).

Almost surely, 2^215640013532 is an apocalyptic number.

It is an amenable number.

215640013532 is a deficient number, since it is larger than the sum of its proper divisors (165192121228).

215640013532 is a wasteful number, since it uses less digits than its factorization.

215640013532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494587300 (or 494587298 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 215640013532 in words is "two hundred fifteen billion, six hundred forty million, thirteen thousand, five hundred thirty-two".