1009977556771 has 2 divisors, whose sum is σ = 1009977556772. Its totient is φ = 1009977556770.

The previous prime is 1009977556769. The next prime is 1009977556793. The reversal of 1009977556771 is 1776557799001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1009977556771 - 2¹ = 1009977556769 is a prime.

It is a super-2 number, since 2×1009977556771² (a number of 25 digits) contains 22 as substring.

Together with 1009977556769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1009977551771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504988778385 + 504988778386.

It is an arithmetic number, because the mean of its divisors is an integer number (504988778386).

Almost surely, 2^{1009977556771} is an apocalyptic number.

1009977556771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009977556771 is an equidigital number, since it uses as much as digits as its factorization.

1009977556771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29172150, while the sum is 64.

The spelling of 1009977556771 in words is "one trillion, nine billion, nine hundred seventy-seven million, five hundred fifty-six thousand, seven hundred seventy-one".