1220995366956 has 252 divisors, whose sum is σ = 3293743931688. Its totient is φ = 395856937728.

The previous prime is 1220995366919. The next prime is 1220995366961. The reversal of 1220995366956 is 6596635990221.

1220995366956 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 9 + 9 + 536 + 6 + 95 + 6 = 666.

It is a super-2 number, since 2×1220995366956² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220995366893 and 1220995366902.

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 2334598911 + ... + 2334599433.

Almost surely, 2^{1220995366956} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220995366956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1646871965844).

1220995366956 is an abundant number, since it is smaller than the sum of its proper divisors (2072748564732).

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

1220995366956 is an equidigital number, since it uses as much as digits as its factorization.

1220995366956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1004 counting only the distinct ones).

The product of its (nonzero) digits is 47239200, while the sum is 63.

The spelling of 1220995366956 in words is "one trillion, two hundred twenty billion, nine hundred ninety-five million, three hundred sixty-six thousand, nine hundred fifty-six".