16615261542 has 64 divisors (see below), whose sum is σ = 38846594304. Its totient is φ = 4681635840.

The previous prime is 16615261529. The next prime is 16615261547. The reversal of 16615261542 is 24516251661.

It is a super-2 number, since 2×16615261542² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16615261542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16615261547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3918 + ... + 182334.

It is an arithmetic number, because the mean of its divisors is an integer number (606978036).

Almost surely, 2^16615261542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16615261542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19423297152).

16615261542 is an abundant number, since it is smaller than the sum of its proper divisors (22231332762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16615261542 is a wasteful number, since it uses less digits than its factorization.

16615261542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178533.

The product of its digits is 86400, while the sum is 39.

The spelling of 16615261542 in words is "sixteen billion, six hundred fifteen million, two hundred sixty-one thousand, five hundred forty-two".