1553861871771 has 12 divisors (see below), whose sum is σ = 2277285167976. Its totient is φ = 941734467520.

The previous prime is 1553861871767. The next prime is 1553861871773. The reversal of 1553861871771 is 1771781683551.

It is not a de Polignac number, because 1553861871771 - 2² = 1553861871767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1553861871773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2140305246 + ... + 2140305971.

It is an arithmetic number, because the mean of its divisors is an integer number (189773763998).

Almost surely, 2^{1553861871771} is an apocalyptic number.

1553861871771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1553861871771 is a deficient number, since it is larger than the sum of its proper divisors (723423296205).

1553861871771 is a wasteful number, since it uses less digits than its factorization.

1553861871771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280611242 (or 4280611231 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 60.

The spelling of 1553861871771 in words is "one trillion, five hundred fifty-three billion, eight hundred sixty-one million, eight hundred seventy-one thousand, seven hundred seventy-one".