87742669521 has 16 divisors (see below), whose sum is σ = 127715361536. Its totient is φ = 53255822976.

The previous prime is 87742669519. The next prime is 87742669589. The reversal of 87742669521 is 12596624778.

It is a happy number.

It is not a de Polignac number, because 87742669521 - 2¹ = 87742669519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87742669121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15406825 + ... + 15412518.

It is an arithmetic number, because the mean of its divisors is an integer number (7982210096).

Almost surely, 2^87742669521 is an apocalyptic number.

It is an amenable number.

87742669521 is a deficient number, since it is larger than the sum of its proper divisors (39972692015).

87742669521 is a wasteful number, since it uses less digits than its factorization.

87742669521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30819432.

The product of its digits is 10160640, while the sum is 57.

The spelling of 87742669521 in words is "eighty-seven billion, seven hundred forty-two million, six hundred sixty-nine thousand, five hundred twenty-one".