30549137478557 has 2 divisors, whose sum is σ = 30549137478558. Its totient is φ = 30549137478556.

The previous prime is 30549137478493. The next prime is 30549137478577. The reversal of 30549137478557 is 75587473194503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27393803420281 + 3155334058276 = 5233909^2 + 1776326^2 .

It is a cyclic number.

It is not a de Polignac number, because 30549137478557 - 2⁶ = 30549137478493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30549137478577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15274568739278 + 15274568739279.

It is an arithmetic number, because the mean of its divisors is an integer number (15274568739279).

Almost surely, 2^{30549137478557} is an apocalyptic number.

It is an amenable number.

30549137478557 is a deficient number, since it is larger than the sum of its proper divisors (1).

30549137478557 is an equidigital number, since it uses as much as digits as its factorization.

30549137478557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 444528000, while the sum is 68.

The spelling of 30549137478557 in words is "thirty trillion, five hundred forty-nine billion, one hundred thirty-seven million, four hundred seventy-eight thousand, five hundred fifty-seven".