10158540721 has 4 divisors (see below), whose sum is σ = 11609760832. Its totient is φ = 8707320612.

The previous prime is 10158540701. The next prime is 10158540739. The reversal of 10158540721 is 12704585101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10158540721 - 2⁷ = 10158540593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10158540701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725610045 + ... + 725610058.

It is an arithmetic number, because the mean of its divisors is an integer number (2902440208).

Almost surely, 2^10158540721 is an apocalyptic number.

It is an amenable number.

10158540721 is a deficient number, since it is larger than the sum of its proper divisors (1451220111).

10158540721 is an equidigital number, since it uses as much as digits as its factorization.

10158540721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451220110.

The product of its (nonzero) digits is 11200, while the sum is 34.

The spelling of 10158540721 in words is "ten billion, one hundred fifty-eight million, five hundred forty thousand, seven hundred twenty-one".