1020557618261 has 16 divisors (see below), whose sum is σ = 1067554857600. Its totient is φ = 974383397568.

The previous prime is 1020557618243. The next prime is 1020557618263. The reversal of 1020557618261 is 1628167550201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020557618261 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 (1020557618263) 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, 1269050 + ... + 1910916.

It is an arithmetic number, because the mean of its divisors is an integer number (66722178600).

Almost surely, 2^{1020557618261} is an apocalyptic number.

It is an amenable number.

1020557618261 is a deficient number, since it is larger than the sum of its proper divisors (46997239339).

1020557618261 is a wasteful number, since it uses less digits than its factorization.

1020557618261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642508.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 1020557618261 in words is "one trillion, twenty billion, five hundred fifty-seven million, six hundred eighteen thousand, two hundred sixty-one".