672277778477 has 2 divisors, whose sum is σ = 672277778478. Its totient is φ = 672277778476.

The previous prime is 672277778437. The next prime is 672277778479. The reversal of 672277778477 is 774877772276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617590085161 + 54687693316 = 785869^2 + 233854^2 .

It is a cyclic number.

It is not a de Polignac number, because 672277778477 - 2⁶ = 672277778413 is a prime.

It is a super-2 number, since 2×672277778477² (a number of 24 digits) contains 22 as substring.

Together with 672277778479, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 672277778477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672277778479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336138889238 + 336138889239.

It is an arithmetic number, because the mean of its divisors is an integer number (336138889239).

Almost surely, 2^672277778477 is an apocalyptic number.

It is an amenable number.

672277778477 is a deficient number, since it is larger than the sum of its proper divisors (1).

672277778477 is an equidigital number, since it uses as much as digits as its factorization.

672277778477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 632481024, while the sum is 71.

The spelling of 672277778477 in words is "six hundred seventy-two billion, two hundred seventy-seven million, seven hundred seventy-eight thousand, four hundred seventy-seven".