2645012581 has 8 divisors (see below), whose sum is σ = 2765646144. Its totient is φ = 2524848480.

The previous prime is 2645012567. The next prime is 2645012611. The reversal of 2645012581 is 1852105462.

It is a happy number.

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 2645012581 - 2¹⁷ = 2644881509 is a prime.

It is a super-2 number, since 2×2645012581² = 13992183107296563122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645012551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105816 + ... + 128401.

It is an arithmetic number, because the mean of its divisors is an integer number (345705768).

Almost surely, 2^2645012581 is an apocalyptic number.

It is an amenable number.

2645012581 is a deficient number, since it is larger than the sum of its proper divisors (120633563).

2645012581 is a wasteful number, since it uses less digits than its factorization.

2645012581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234731.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 2645012581 is about 51429.6857952681. The cubic root of 2645012581 is about 1382.9588166125.

The spelling of 2645012581 in words is "two billion, six hundred forty-five million, twelve thousand, five hundred eighty-one".