2491779851127 has 36 divisors (see below), whose sum is σ = 4197509331600. Its totient is φ = 1423824083640.

The previous prime is 2491779851123. The next prime is 2491779851237. The reversal of 2491779851127 is 7211589771942.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

2491779851127 is a `hidden beast` number, since 2 + 4 + 9 + 1 + 7 + 7 + 98 + 511 + 27 = 666.

It is not a de Polignac number, because 2491779851127 - 2² = 2491779851123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491779851123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87690552 + ... + 87718962.

Almost surely, 2^{2491779851127} is an apocalyptic number.

2491779851127 is a deficient number, since it is larger than the sum of its proper divisors (1705729480473).

2491779851127 is an frugal number, since it uses more digits than its factorization.

2491779851127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56849 (or 28421 counting only the distinct ones).

The product of its digits is 17781120, while the sum is 63.

Multiplying 2491779851127 by its sum of digits (63), we get a square (156982130621001 = 12529251²).

2491779851127 divided by its sum of digits (63) gives a square (39552061129 = 198877²).

The spelling of 2491779851127 in words is "two trillion, four hundred ninety-one billion, seven hundred seventy-nine million, eight hundred fifty-one thousand, one hundred twenty-seven".