2506145781 has 8 divisors (see below), whose sum is σ = 3341774880. Its totient is φ = 1670640272.

The previous prime is 2506145779. The next prime is 2506145783. The reversal of 2506145781 is 1875416052.

It is an interprime number because it is at equal distance from previous prime (2506145779) and next prime (2506145783).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2506145781 - 2¹ = 2506145779 is a prime.

It is a super-2 number, since 2×2506145781² = 12561533351248199922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506145783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39031 + ... + 80843.

It is an arithmetic number, because the mean of its divisors is an integer number (417721860).

Almost surely, 2^2506145781 is an apocalyptic number.

It is an amenable number.

2506145781 is a deficient number, since it is larger than the sum of its proper divisors (835629099).

2506145781 is a wasteful number, since it uses less digits than its factorization.

2506145781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61795.

The product of its (nonzero) digits is 67200, while the sum is 39.

The square root of 2506145781 is about 50061.4200857307. The cubic root of 2506145781 is about 1358.3200459521.

The spelling of 2506145781 in words is "two billion, five hundred six million, one hundred forty-five thousand, seven hundred eighty-one".