1081720477771 has 4 divisors (see below), whose sum is σ = 1082855547432. Its totient is φ = 1080585408112.

The previous prime is 1081720477757. The next prime is 1081720477823. The reversal of 1081720477771 is 1777740271801.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1081720477771 - 2³³ = 1073130543179 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 567533401 + ... + 567535306.

It is an arithmetic number, because the mean of its divisors is an integer number (270713886858).

Almost surely, 2^{1081720477771} is an apocalyptic number.

1081720477771 is a deficient number, since it is larger than the sum of its proper divisors (1135069661).

1081720477771 is an equidigital number, since it uses as much as digits as its factorization.

1081720477771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135069660.

The product of its (nonzero) digits is 1075648, while the sum is 52.

The spelling of 1081720477771 in words is "one trillion, eighty-one billion, seven hundred twenty million, four hundred seventy-seven thousand, seven hundred seventy-one".