977220817879 has 2 divisors, whose sum is σ = 977220817880. Its totient is φ = 977220817878.

The previous prime is 977220817873. The next prime is 977220817933. The reversal of 977220817879 is 978718022779.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 977220817879 - 2⁹ = 977220817367 is a prime.

It is a super-2 number, since 2×977220817879² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977220817873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488610408939 + 488610408940.

It is an arithmetic number, because the mean of its divisors is an integer number (488610408940).

Almost surely, 2^977220817879 is an apocalyptic number.

977220817879 is a deficient number, since it is larger than the sum of its proper divisors (1).

977220817879 is an equidigital number, since it uses as much as digits as its factorization.

977220817879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49787136, while the sum is 67.

The spelling of 977220817879 in words is "nine hundred seventy-seven billion, two hundred twenty million, eight hundred seventeen thousand, eight hundred seventy-nine".