1081720477784 has 8 divisors (see below), whose sum is σ = 2028225895860. Its totient is φ = 540860238888.

The previous prime is 1081720477757. The next prime is 1081720477823. The reversal of 1081720477784 is 4877740271801.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67607529854 + ... + 67607529869.

Almost surely, 2^{1081720477784} is an apocalyptic number.

It is an amenable number.

1081720477784 is a deficient number, since it is larger than the sum of its proper divisors (946505418076).

1081720477784 is a wasteful number, since it uses less digits than its factorization.

1081720477784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135215059729 (or 135215059725 counting only the distinct ones).

The product of its (nonzero) digits is 4917248, while the sum is 56.

The spelling of 1081720477784 in words is "one trillion, eighty-one billion, seven hundred twenty million, four hundred seventy-seven thousand, seven hundred eighty-four".