1220699961504 has 144 divisors (see below), whose sum is σ = 3531569932800. Its totient is φ = 399848414208.

The previous prime is 1220699961491. The next prime is 1220699961541. The reversal of 1220699961504 is 4051699960221.

1220699961504 is a `hidden beast` number, since 12 + 2 + 0 + 6 + 9 + 9 + 9 + 615 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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, 48907492 + ... + 48932444.

It is an arithmetic number, because the mean of its divisors is an integer number (24524791200).

Almost surely, 2^{1220699961504} 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 1220699961504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765784966400).

1220699961504 is an abundant number, since it is smaller than the sum of its proper divisors (2310869971296).

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

1220699961504 is a wasteful number, since it uses less digits than its factorization.

1220699961504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27907 (or 27896 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The spelling of 1220699961504 in words is "one trillion, two hundred twenty billion, six hundred ninety-nine million, nine hundred sixty-one thousand, five hundred four".