11661021506442 has 64 divisors (see below), whose sum is σ = 29348579073024. Its totient is φ = 3000529856640.

The previous prime is 11661021506371. The next prime is 11661021506473. The reversal of 11661021506442 is 24460512016611.

It is a self number, because there is not a number n which added to its sum of digits gives 11661021506442.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117895923 + ... + 117994790.

It is an arithmetic number, because the mean of its divisors is an integer number (458571548016).

Almost surely, 2^{11661021506442} is an apocalyptic number.

11661021506442 is an abundant number, since it is smaller than the sum of its proper divisors (17687557566582).

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

11661021506442 is a wasteful number, since it uses less digits than its factorization.

11661021506442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235890843.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 11661021506442 in words is "eleven trillion, six hundred sixty-one billion, twenty-one million, five hundred six thousand, four hundred forty-two".