1020542155522 has 4 divisors (see below), whose sum is σ = 1530813233286. Its totient is φ = 510271077760.

The previous prime is 1020542155489. The next prime is 1020542155559. The reversal of 1020542155522 is 2255512450201.

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

It can be written as a sum of positive squares in only one way, i.e., 800561457081 + 219980698441 = 894741^2 + 469021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255135538879 + ... + 255135538882.

Almost surely, 2^{1020542155522} is an apocalyptic number.

1020542155522 is a deficient number, since it is larger than the sum of its proper divisors (510271077764).

1020542155522 is an equidigital number, since it uses as much as digits as its factorization.

1020542155522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510271077763.

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 1020542155522 in words is "one trillion, twenty billion, five hundred forty-two million, one hundred fifty-five thousand, five hundred twenty-two".