215534132255501 has 4 divisors (see below), whose sum is σ = 215543450255904. Its totient is φ = 215524814255100.

The previous prime is 215534132255411. The next prime is 215534132255513. The reversal of 215534132255501 is 105552231435512.

215534132255501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215534132255501 - 2¹⁸ = 215534131993357 is a prime.

It is a super-2 number, since 2×215534132255501² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215534132255531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4658965505 + ... + 4659011766.

It is an arithmetic number, because the mean of its divisors is an integer number (53885862563976).

Almost surely, 2^{215534132255501} is an apocalyptic number.

It is an amenable number.

215534132255501 is a deficient number, since it is larger than the sum of its proper divisors (9318000403).

215534132255501 is an equidigital number, since it uses as much as digits as its factorization.

215534132255501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9318000402.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 215534132255501 in words is "two hundred fifteen trillion, five hundred thirty-four billion, one hundred thirty-two million, two hundred fifty-five thousand, five hundred one".