158921018406544 has 45 divisors (see below), whose sum is σ = 308927033430363. Its totient is φ = 79198775375616.

The previous prime is 158921018406533. The next prime is 158921018406547. The reversal of 158921018406544 is 445604810129851.

The square root of 158921018406544 is 12606388.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 107136990490000 + 51784027916544 = 10350700^2 + 7196112^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158921018406547) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15783192742 + ... + 15783202810.

Almost surely, 2^{158921018406544} is an apocalyptic number.

158921018406544 is the 12606388-th square number.

It is an amenable number.

158921018406544 is a deficient number, since it is larger than the sum of its proper divisors (150006015023819).

158921018406544 is an frugal number, since it uses more digits than its factorization.

158921018406544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20772 (or 10384 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 58.

The spelling of 158921018406544 in words is "one hundred fifty-eight trillion, nine hundred twenty-one billion, eighteen million, four hundred six thousand, five hundred forty-four".