1081720477756 has 48 divisors (see below), whose sum is σ = 2047533616800. Its totient is φ = 498293192448.

The previous prime is 1081720477751. The next prime is 1081720477757. The reversal of 1081720477756 is 6577740271801.

It is a junction number, because it is equal to n+sod(n) for n = 1081720477697 and 1081720477706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081720477751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5519250 + ... + 5711878.

It is an arithmetic number, because the mean of its divisors is an integer number (42656950350).

Almost surely, 2^{1081720477756} is an apocalyptic number.

It is an amenable number.

1081720477756 is a deficient number, since it is larger than the sum of its proper divisors (965813139044).

1081720477756 is a wasteful number, since it uses less digits than its factorization.

1081720477756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194686 (or 194684 counting only the distinct ones).

The product of its (nonzero) digits is 4609920, while the sum is 55.

The spelling of 1081720477756 in words is "one trillion, eighty-one billion, seven hundred twenty million, four hundred seventy-seven thousand, seven hundred fifty-six".