820252497842 has 6 divisors (see below), whose sum is σ = 1230380667999. Its totient is φ = 410125608510.

The previous prime is 820252497833. The next prime is 820252497853. The reversal of 820252497842 is 248794252028.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 410126248921 + 410126248921 = 640411^2 + 640411^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=640411.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 960617 + ... + 1601027.

Almost surely, 2^820252497842 is an apocalyptic number.

820252497842 is a deficient number, since it is larger than the sum of its proper divisors (410128170157).

820252497842 is an frugal number, since it uses more digits than its factorization.

820252497842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280824 (or 640413 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 53.

The spelling of 820252497842 in words is "eight hundred twenty billion, two hundred fifty-two million, four hundred ninety-seven thousand, eight hundred forty-two".