820778154142 has 32 divisors (see below), whose sum is σ = 1320552979200. Its totient is φ = 381439631808.

The previous prime is 820778154121. The next prime is 820778154143. The reversal of 820778154142 is 241451877028.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820778154143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763818 + ... + 1491634.

It is an arithmetic number, because the mean of its divisors is an integer number (41267280600).

Almost surely, 2^820778154142 is an apocalyptic number.

820778154142 is a deficient number, since it is larger than the sum of its proper divisors (499774825058).

820778154142 is a wasteful number, since it uses less digits than its factorization.

820778154142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728400.

The product of its (nonzero) digits is 1003520, while the sum is 49.

The spelling of 820778154142 in words is "eight hundred twenty billion, seven hundred seventy-eight million, one hundred fifty-four thousand, one hundred forty-two".