215534131993357 has 2 divisors, whose sum is σ = 215534131993358. Its totient is φ = 215534131993356.

The previous prime is 215534131993351. The next prime is 215534131993399. The reversal of 215534131993357 is 753399131435512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198654902061001 + 16879229932356 = 14094499^2 + 4108434^2 .

It is a cyclic number.

It is not a de Polignac number, because 215534131993357 - 2⁴⁷ = 74796643638029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215534131993295 and 215534131993304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215534131993351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107767065996678 + 107767065996679.

It is an arithmetic number, because the mean of its divisors is an integer number (107767065996679).

Almost surely, 2^{215534131993357} is an apocalyptic number.

It is an amenable number.

215534131993357 is a deficient number, since it is larger than the sum of its proper divisors (1).

215534131993357 is an equidigital number, since it uses as much as digits as its factorization.

215534131993357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45927000, while the sum is 61.

The spelling of 215534131993357 in words is "two hundred fifteen trillion, five hundred thirty-four billion, one hundred thirty-one million, nine hundred ninety-three thousand, three hundred fifty-seven".