1081720477782 has 36 divisors (see below), whose sum is σ = 2726377124796. Its totient is φ = 309062993400.

The previous prime is 1081720477757. The next prime is 1081720477823. The reversal of 1081720477782 is 2877740271801.

1081720477782 is a `hidden beast` number, since 1 + 0 + 81 + 7 + 20 + 477 + 78 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 613219344 + ... + 613221107.

It is an arithmetic number, because the mean of its divisors is an integer number (75732697911).

Almost surely, 2^{1081720477782} is an apocalyptic number.

1081720477782 is an abundant number, since it is smaller than the sum of its proper divisors (1644656647014).

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

1081720477782 is a wasteful number, since it uses less digits than its factorization.

1081720477782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226440473 (or 1226440463 counting only the distinct ones).

The product of its (nonzero) digits is 2458624, while the sum is 54.

The spelling of 1081720477782 in words is "one trillion, eighty-one billion, seven hundred twenty million, four hundred seventy-seven thousand, seven hundred eighty-two".