1198951855920 has 1440 divisors, whose sum is σ = 5448241004544. Its totient is φ = 230318899200.

The previous prime is 1198951855901. The next prime is 1198951855939. The reversal of 1198951855920 is 295581598911.

1198951855920 is a `hidden beast` number, since 1 + 1 + 9 + 8 + 9 + 51 + 8 + 559 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1198951855901) and next prime (1198951855939).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 448876185 + ... + 448878855.

Almost surely, 2^{1198951855920} is an apocalyptic number.

1198951855920 is a gapful number since it is divisible by the number (10) 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 1198951855920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2724120502272).

1198951855920 is an abundant number, since it is smaller than the sum of its proper divisors (4249289148624).

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

1198951855920 is a wasteful number, since it uses less digits than its factorization.

1198951855920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2749 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 63.

The spelling of 1198951855920 in words is "one trillion, one hundred ninety-eight billion, nine hundred fifty-one million, eight hundred fifty-five thousand, nine hundred twenty".