87650557549 has 4 divisors (see below), whose sum is σ = 87664113340. Its totient is φ = 87637001760.

The previous prime is 87650557531. The next prime is 87650557573. The reversal of 87650557549 is 94575505678.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24330384324 + 63320173225 = 155982^2 + 251635^2 .

It is a cyclic number.

It is not a de Polignac number, because 87650557549 - 2⁹ = 87650557037 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 (87650557949) 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, 6768192 + ... + 6781129.

It is an arithmetic number, because the mean of its divisors is an integer number (21916028335).

Almost surely, 2^87650557549 is an apocalyptic number.

It is an amenable number.

87650557549 is a deficient number, since it is larger than the sum of its proper divisors (13555791).

87650557549 is a wasteful number, since it uses less digits than its factorization.

87650557549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555790.

The product of its (nonzero) digits is 52920000, while the sum is 61.

The spelling of 87650557549 in words is "eighty-seven billion, six hundred fifty million, five hundred fifty-seven thousand, five hundred forty-nine".