420078476677 has 4 divisors (see below), whose sum is σ = 434563941420. Its totient is φ = 405593011936.

The previous prime is 420078476647. The next prime is 420078476683. The reversal of 420078476677 is 776674870024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82254813601 + 337823663076 = 286801^2 + 581226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420078476677 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420078476647) 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 in 3 ways as a sum of consecutive naturals, for example, 7242732328 + ... + 7242732385.

It is an arithmetic number, because the mean of its divisors is an integer number (108640985355).

Almost surely, 2^420078476677 is an apocalyptic number.

It is an amenable number.

420078476677 is a deficient number, since it is larger than the sum of its proper divisors (14485464743).

420078476677 is a wasteful number, since it uses less digits than its factorization.

420078476677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14485464742.

The product of its (nonzero) digits is 22127616, while the sum is 58.

The spelling of 420078476677 in words is "four hundred twenty billion, seventy-eight million, four hundred seventy-six thousand, six hundred seventy-seven".