1011013991856 has 450 divisors, whose sum is σ = 3222441397500. Its totient is φ = 295890883200.

The previous prime is 1011013991849. The next prime is 1011013991899. The reversal of 1011013991856 is 6581993101101.

It is a happy number.

1011013991856 is a `hidden beast` number, since 101 + 101 + 399 + 1 + 8 + 56 = 666.

1011013991856 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 2026079895 + ... + 2026080393.

Almost surely, 2^{1011013991856} is an apocalyptic number.

1011013991856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011013991856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611220698750).

1011013991856 is an abundant number, since it is smaller than the sum of its proper divisors (2211427405644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011013991856 is an equidigital number, since it uses as much as digits as its factorization.

1011013991856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 45.

The spelling of 1011013991856 in words is "one trillion, eleven billion, thirteen million, nine hundred ninety-one thousand, eight hundred fifty-six".