1661057837436 has 24 divisors (see below), whose sum is σ = 3876158845440. Its totient is φ = 553634913712.

The previous prime is 1661057837399. The next prime is 1661057837437. The reversal of 1661057837436 is 6347387501661.

It is a happy number.

It is a super-2 number, since 2×1661057837436² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661057837437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6243276 + ... + 6503891.

It is an arithmetic number, because the mean of its divisors is an integer number (161506618560).

Almost surely, 2^{1661057837436} is an apocalyptic number.

It is an amenable number.

1661057837436 is an abundant number, since it is smaller than the sum of its proper divisors (2215101008004).

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

1661057837436 is a wasteful number, since it uses less digits than its factorization.

1661057837436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12758033 (or 12758031 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 57.

The spelling of 1661057837436 in words is "one trillion, six hundred sixty-one billion, fifty-seven million, eight hundred thirty-seven thousand, four hundred thirty-six".