16615523101 has 4 divisors (see below), whose sum is σ = 17020779804. Its totient is φ = 16210266400.

The previous prime is 16615523069. The next prime is 16615523147. The reversal of 16615523101 is 10132551661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10132551661 = 30109 ⋅336529.

It can be written as a sum of positive squares in 2 ways, for example, as 9384571876 + 7230951225 = 96874^2 + 85035^2 .

It is a cyclic number.

It is not a de Polignac number, because 16615523101 - 2⁵ = 16615523069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16615523191) 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, 202628290 + ... + 202628371.

It is an arithmetic number, because the mean of its divisors is an integer number (4255194951).

Almost surely, 2^16615523101 is an apocalyptic number.

It is an amenable number.

16615523101 is a deficient number, since it is larger than the sum of its proper divisors (405256703).

16615523101 is an equidigital number, since it uses as much as digits as its factorization.

16615523101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405256702.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 16615523101 in words is "sixteen billion, six hundred fifteen million, five hundred twenty-three thousand, one hundred one".