30643161557 has 4 divisors (see below), whose sum is σ = 30752212236. Its totient is φ = 30534110880.

The previous prime is 30643161541. The next prime is 30643161611. The reversal of 30643161557 is 75516134603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25022810596 + 5620350961 = 158186^2 + 74969^2 .

It is a cyclic number.

It is not a de Polignac number, because 30643161557 - 2⁴ = 30643161541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30643167557) 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, 54524918 + ... + 54525479.

It is an arithmetic number, because the mean of its divisors is an integer number (7688053059).

Almost surely, 2^30643161557 is an apocalyptic number.

It is an amenable number.

30643161557 is a deficient number, since it is larger than the sum of its proper divisors (109050679).

30643161557 is a wasteful number, since it uses less digits than its factorization.

30643161557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109050678.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 30643161557 in words is "thirty billion, six hundred forty-three million, one hundred sixty-one thousand, five hundred fifty-seven".