1661057837244 has 36 divisors (see below), whose sum is σ = 4521768558216. Its totient is φ = 511094719008.

The previous prime is 1661057837209. The next prime is 1661057837251. The reversal of 1661057837244 is 4427387501661.

1661057837244 is a `hidden beast` number, since 1 + 6 + 6 + 10 + 578 + 37 + 24 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1661057837244² (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 11 ways as a sum of consecutive naturals, for example, 1774633974 + ... + 1774634909.

Almost surely, 2^{1661057837244} is an apocalyptic number.

It is an amenable number.

1661057837244 is an abundant number, since it is smaller than the sum of its proper divisors (2860710720972).

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

1661057837244 is a wasteful number, since it uses less digits than its factorization.

1661057837244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549268906 (or 3549268901 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 1661057837244 in words is "one trillion, six hundred sixty-one billion, fifty-seven million, eight hundred thirty-seven thousand, two hundred forty-four".