1999101837456 has 120 divisors (see below), whose sum is σ = 5714900365824. Its totient is φ = 652057374720.

The previous prime is 1999101837449. The next prime is 1999101837487. The reversal of 1999101837456 is 6547381019991.

1999101837456 is a `hidden beast` number, since 1 + 9 + 99 + 10 + 1 + 83 + 7 + 456 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1999101837393 and 1999101837402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36797545 + ... + 36851831.

Almost surely, 2^{1999101837456} is an apocalyptic number.

1999101837456 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 1999101837456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2857450182912).

1999101837456 is an abundant number, since it is smaller than the sum of its proper divisors (3715798528368).

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

1999101837456 is a wasteful number, since it uses less digits than its factorization.

1999101837456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59789 (or 59780 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 63.

The spelling of 1999101837456 in words is "one trillion, nine hundred ninety-nine billion, one hundred one million, eight hundred thirty-seven thousand, four hundred fifty-six".