2491778785275 has 72 divisors (see below), whose sum is σ = 4936266367760. Its totient is φ = 1193567166720.

The previous prime is 2491778785213. The next prime is 2491778785289. The reversal of 2491778785275 is 5725878771942.

2491778785275 is a `hidden beast` number, since 2 + 4 + 9 + 17 + 7 + 87 + 8 + 527 + 5 = 666.

It is not a de Polignac number, because 2491778785275 - 2⁷ = 2491778785147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11403805 + ... + 11620254.

Almost surely, 2^{2491778785275} is an apocalyptic number.

2491778785275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2491778785275 is a deficient number, since it is larger than the sum of its proper divisors (2444487582485).

2491778785275 is a wasteful number, since it uses less digits than its factorization.

2491778785275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23024125 (or 23024117 counting only the distinct ones).

The product of its digits is 553190400, while the sum is 72.

The spelling of 2491778785275 in words is "two trillion, four hundred ninety-one billion, seven hundred seventy-eight million, seven hundred eighty-five thousand, two hundred seventy-five".