1861051066956 has 36 divisors (see below), whose sum is σ = 4704376137552. Its totient is φ = 620343418464.

The previous prime is 1861051066939. The next prime is 1861051066969. The reversal of 1861051066956 is 6596601501681.

1861051066956 is a `hidden beast` number, since 1 + 8 + 6 + 10 + 510 + 6 + 69 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1861051066956² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3746865 + ... + 4214391.

It is an arithmetic number, because the mean of its divisors is an integer number (130677114932).

Almost surely, 2^{1861051066956} is an apocalyptic number.

It is an amenable number.

1861051066956 is an abundant number, since it is smaller than the sum of its proper divisors (2843325070596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861051066956 is a wasteful number, since it uses less digits than its factorization.

1861051066956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578110 (or 578105 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 1861051066956 in words is "one trillion, eight hundred sixty-one billion, fifty-one million, sixty-six thousand, nine hundred fifty-six".