155020066350561 has 48 divisors (see below), whose sum is σ = 241216472420352. Its totient is φ = 95654311394400.

The previous prime is 155020066350553. The next prime is 155020066350563. The reversal of 155020066350561 is 165053660020551.

155020066350561 is a `hidden beast` number, since 1 + 5 + 5 + 0 + 2 + 0 + 0 + 6 + 635 + 0 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 155020066350561 - 2³ = 155020066350553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155020066350563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58844746 + ... + 61422668.

It is an arithmetic number, because the mean of its divisors is an integer number (5025343175424).

Almost surely, 2^{155020066350561} is an apocalyptic number.

It is an amenable number.

155020066350561 is a deficient number, since it is larger than the sum of its proper divisors (86196406069791).

155020066350561 is a wasteful number, since it uses less digits than its factorization.

155020066350561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587354 (or 2587351 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 155020066350561 in words is "one hundred fifty-five trillion, twenty billion, sixty-six million, three hundred fifty thousand, five hundred sixty-one".