215255531540 has 24 divisors (see below), whose sum is σ = 516613276032. Its totient is φ = 73801896480.

The previous prime is 215255531531. The next prime is 215255531549. The reversal of 215255531540 is 45135552512.

It is an interprime number because it is at equal distance from previous prime (215255531531) and next prime (215255531549).

It is a junction number, because it is equal to n+sod(n) for n = 215255531494 and 215255531503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215255531549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768769616 + ... + 768769895.

It is an arithmetic number, because the mean of its divisors is an integer number (21525553168).

Almost surely, 2^215255531540 is an apocalyptic number.

215255531540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215255531540 is an abundant number, since it is smaller than the sum of its proper divisors (301357744492).

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

215255531540 is a wasteful number, since it uses less digits than its factorization.

215255531540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537539527 (or 1537539525 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 38.

The spelling of 215255531540 in words is "two hundred fifteen billion, two hundred fifty-five million, five hundred thirty-one thousand, five hundred forty".