855107542121 has 6 divisors (see below), whose sum is σ = 994716936810. Its totient is φ = 732949321776.

The previous prime is 855107542111. The next prime is 855107542123. The reversal of 855107542121 is 121245701558.

It can be written as a sum of positive squares in only one way, i.e., 448981743721 + 406125798400 = 670061^2 + 637280^2 .

It is not a de Polignac number, because 855107542121 - 2³⁸ = 580229635177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (855107542123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8725587116 + ... + 8725587213.

It is an arithmetic number, because the mean of its divisors is an integer number (165786156135).

Almost surely, 2^855107542121 is an apocalyptic number.

It is an amenable number.

855107542121 is a deficient number, since it is larger than the sum of its proper divisors (139609394689).

855107542121 is a wasteful number, since it uses less digits than its factorization.

855107542121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17451174343 (or 17451174336 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 41.

The spelling of 855107542121 in words is "eight hundred fifty-five billion, one hundred seven million, five hundred forty-two thousand, one hundred twenty-one".