61405428979 has 2 divisors, whose sum is σ = 61405428980. Its totient is φ = 61405428978.

The previous prime is 61405428971. The next prime is 61405429009. The reversal of 61405428979 is 97982450416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61405428979 - 2³ = 61405428971 is a prime.

It is not a weakly prime, because it can be changed into another prime (61405428971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30702714489 + 30702714490.

It is an arithmetic number, because the mean of its divisors is an integer number (30702714490).

Almost surely, 2^61405428979 is an apocalyptic number.

61405428979 is a deficient number, since it is larger than the sum of its proper divisors (1).

61405428979 is an equidigital number, since it uses as much as digits as its factorization.

61405428979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 61405428979 in words is "sixty-one billion, four hundred five million, four hundred twenty-eight thousand, nine hundred seventy-nine".