16615420895 has 4 divisors (see below), whose sum is σ = 19938505080. Its totient is φ = 13292336712.

The previous prime is 16615420859. The next prime is 16615420931. The reversal of 16615420895 is 59802451661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59802451661 = 79 ⋅756993059.

It is an interprime number because it is at equal distance from previous prime (16615420859) and next prime (16615420931).

It is a cyclic number.

It is not a de Polignac number, because 16615420895 - 2⁶ = 16615420831 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661542085 + ... + 1661542094.

It is an arithmetic number, because the mean of its divisors is an integer number (4984626270).

Almost surely, 2^16615420895 is an apocalyptic number.

16615420895 is a deficient number, since it is larger than the sum of its proper divisors (3323084185).

16615420895 is an equidigital number, since it uses as much as digits as its factorization.

16615420895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323084184.

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 16615420895 in words is "sixteen billion, six hundred fifteen million, four hundred twenty thousand, eight hundred ninety-five".