1020115551556 has 24 divisors (see below), whose sum is σ = 1842958315520. Its totient is φ = 493559049600.

The previous prime is 1020115551523. The next prime is 1020115551563. The reversal of 1020115551556 is 6551555110201.

It is a super-2 number, since 2×1020115551556² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001260 + ... + 1744348.

Almost surely, 2^{1020115551556} is an apocalyptic number.

It is an amenable number.

1020115551556 is a deficient number, since it is larger than the sum of its proper divisors (822842763964).

1020115551556 is a wasteful number, since it uses less digits than its factorization.

1020115551556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754195 (or 754193 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 37.

The spelling of 1020115551556 in words is "one trillion, twenty billion, one hundred fifteen million, five hundred fifty-one thousand, five hundred fifty-six".