16015525661 has 8 divisors (see below), whose sum is σ = 16439250648. Its totient is φ = 15597000000.

The previous prime is 16015525649. The next prime is 16015525663. The reversal of 16015525661 is 16652551061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3803065561 + 12212460100 = 61669^2 + 110510^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16015525661 - 2²⁶ = 15948416797 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 (16015525663) 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 7 ways as a sum of consecutive naturals, for example, 1293590 + ... + 1305911.

It is an arithmetic number, because the mean of its divisors is an integer number (2054906331).

Almost surely, 2^16015525661 is an apocalyptic number.

It is an amenable number.

16015525661 is a deficient number, since it is larger than the sum of its proper divisors (423724987).

16015525661 is a wasteful number, since it uses less digits than its factorization.

16015525661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599663.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 16015525661 in words is "sixteen billion, fifteen million, five hundred twenty-five thousand, six hundred sixty-one".