30978357077 has 2 divisors, whose sum is σ = 30978357078. Its totient is φ = 30978357076.

The previous prime is 30978357023. The next prime is 30978357079. The reversal of 30978357077 is 77075387903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30663862321 + 314494756 = 175111^2 + 17734^2 .

It is a cyclic number.

It is not a de Polignac number, because 30978357077 - 2²⁰ = 30977308501 is a prime.

Together with 30978357079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30978357079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15489178538 + 15489178539.

It is an arithmetic number, because the mean of its divisors is an integer number (15489178539).

Almost surely, 2^30978357077 is an apocalyptic number.

It is an amenable number.

30978357077 is a deficient number, since it is larger than the sum of its proper divisors (1).

30978357077 is an equidigital number, since it uses as much as digits as its factorization.

30978357077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7779240, while the sum is 56.

The spelling of 30978357077 in words is "thirty billion, nine hundred seventy-eight million, three hundred fifty-seven thousand, seventy-seven".