1661037826560 has 320 divisors, whose sum is σ = 6103833829632. Its totient is φ = 377469075456.

The previous prime is 1661037826507. The next prime is 1661037826571. The reversal of 1661037826560 is 656287301661.

It is a tau number, because it is divible by the number of its divisors (320).

It is a super-2 number, since 2×1661037826560² (a number of 25 digits) contains 22 as substring.

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, 9211182 + ... + 9389778.

Almost surely, 2^{1661037826560} is an apocalyptic number.

1661037826560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661037826560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3051916914816).

1661037826560 is an abundant number, since it is smaller than the sum of its proper divisors (4442796003072).

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

1661037826560 is a wasteful number, since it uses less digits than its factorization.

1661037826560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178803 (or 178787 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 1661037826560 in words is "one trillion, six hundred sixty-one billion, thirty-seven million, eight hundred twenty-six thousand, five hundred sixty".