2540650721 has 8 divisors (see below), whose sum is σ = 3056422080. Its totient is φ = 2063084688.

The previous prime is 2540650699. The next prime is 2540650727. The reversal of 2540650721 is 1270560452.

2540650721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2540650721 - 2³⁰ = 1466908897 is a prime.

It is a super-2 number, since 2×2540650721² = 12909812172235639682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2540650727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9551186 + ... + 9551451.

It is an arithmetic number, because the mean of its divisors is an integer number (382052760).

Almost surely, 2^2540650721 is an apocalyptic number.

It is an amenable number.

2540650721 is a deficient number, since it is larger than the sum of its proper divisors (515771359).

2540650721 is a wasteful number, since it uses less digits than its factorization.

2540650721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19102663.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 2540650721 is about 50404.8680287926. The cubic root of 2540650721 is about 1364.5254955072.

The spelling of 2540650721 in words is "two billion, five hundred forty million, six hundred fifty thousand, seven hundred twenty-one".