1661214221150 has 72 divisors (see below), whose sum is σ = 3460372318872. Its totient is φ = 592680088000.

The previous prime is 1661214221137. The next prime is 1661214221167. The reversal of 1661214221150 is 511224121661.

It is a happy number.

It is a super-2 number, since 2×1661214221150² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2269736 + ... + 2911035.

It is an arithmetic number, because the mean of its divisors is an integer number (48060726651).

Almost surely, 2^{1661214221150} is an apocalyptic number.

1661214221150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661214221150 is an abundant number, since it is smaller than the sum of its proper divisors (1799158097722).

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

1661214221150 is a wasteful number, since it uses less digits than its factorization.

1661214221150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180858 (or 5180842 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 1661214221150 in words is "one trillion, six hundred sixty-one billion, two hundred fourteen million, two hundred twenty-one thousand, one hundred fifty".