150561514531661 has 8 divisors (see below), whose sum is σ = 159434175597624. Its totient is φ = 141690642508800.

The previous prime is 150561514531651. The next prime is 150561514531711. The reversal of 150561514531661 is 166135415165051.

It can be written as a sum of positive squares in 4 ways, for example, as 63529986124900 + 87031528406761 = 7970570^2 + 9329069^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-150561514531661 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 (150561514531651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447087500 + ... + 447424133.

It is an arithmetic number, because the mean of its divisors is an integer number (19929271949703).

Almost surely, 2^{150561514531661} is an apocalyptic number.

It is an amenable number.

150561514531661 is a deficient number, since it is larger than the sum of its proper divisors (8872661065963).

150561514531661 is an equidigital number, since it uses as much as digits as its factorization.

150561514531661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894521551.

The product of its (nonzero) digits is 1620000, while the sum is 50.

The spelling of 150561514531661 in words is "one hundred fifty trillion, five hundred sixty-one billion, five hundred fourteen million, five hundred thirty-one thousand, six hundred sixty-one".