135621990615 has 8 divisors (see below), whose sum is σ = 216995185008. Its totient is φ = 72331728320.

The previous prime is 135621990607. The next prime is 135621990617. The reversal of 135621990615 is 516099126531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135621990615 - 2³ = 135621990607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135621990617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4520733006 + ... + 4520733035.

It is an arithmetic number, because the mean of its divisors is an integer number (27124398126).

Almost surely, 2^135621990615 is an apocalyptic number.

135621990615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135621990615 is a deficient number, since it is larger than the sum of its proper divisors (81373194393).

135621990615 is an equidigital number, since it uses as much as digits as its factorization.

135621990615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9041466049.

The product of its (nonzero) digits is 437400, while the sum is 48.

The spelling of 135621990615 in words is "one hundred thirty-five billion, six hundred twenty-one million, nine hundred ninety thousand, six hundred fifteen".