61978143301 has 2 divisors, whose sum is σ = 61978143302. Its totient is φ = 61978143300.

The previous prime is 61978143299. The next prime is 61978143323. The reversal of 61978143301 is 10334187916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61946232100 + 31911201 = 248890^2 + 5649^2 .

It is a cyclic number.

It is not a de Polignac number, because 61978143301 - 2¹ = 61978143299 is a prime.

Together with 61978143299, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61978143001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30989071650 + 30989071651.

It is an arithmetic number, because the mean of its divisors is an integer number (30989071651).

Almost surely, 2^61978143301 is an apocalyptic number.

It is an amenable number.

61978143301 is a deficient number, since it is larger than the sum of its proper divisors (1).

61978143301 is an equidigital number, since it uses as much as digits as its factorization.

61978143301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 61978143301 in words is "sixty-one billion, nine hundred seventy-eight million, one hundred forty-three thousand, three hundred one".