9157430779721 has 16 divisors (see below), whose sum is σ = 10644188097408. Its totient is φ = 7715480688000.

The previous prime is 9157430779709. The next prime is 9157430779877. The reversal of 9157430779721 is 1279770347519.

It is a cyclic number.

It is not a de Polignac number, because 9157430779721 - 2¹⁸ = 9157430517577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9157430779121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6390380 + ... + 7691021.

It is an arithmetic number, because the mean of its divisors is an integer number (665261756088).

Almost surely, 2^{9157430779721} is an apocalyptic number.

It is an amenable number.

9157430779721 is a deficient number, since it is larger than the sum of its proper divisors (1486757317687).

9157430779721 is a wasteful number, since it uses less digits than its factorization.

9157430779721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14082992.

The product of its (nonzero) digits is 23337720, while the sum is 62.

The spelling of 9157430779721 in words is "nine trillion, one hundred fifty-seven billion, four hundred thirty million, seven hundred seventy-nine thousand, seven hundred twenty-one".