1661057837469 has 32 divisors (see below), whose sum is σ = 2606543988480. Its totient is φ = 1041847142400.

The previous prime is 1661057837447. The next prime is 1661057837489. The reversal of 1661057837469 is 9647387501661.

1661057837469 is a `hidden beast` number, since 1 + 6 + 6 + 10 + 578 + 3 + 7 + 46 + 9 = 666.

It is not a de Polignac number, because 1661057837469 - 2⁵ = 1661057837437 is a prime.

It is a super-2 number, since 2×1661057837469² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661057837489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 576909 + ... + 1911789.

It is an arithmetic number, because the mean of its divisors is an integer number (81454499640).

Almost surely, 2^{1661057837469} is an apocalyptic number.

It is an amenable number.

1661057837469 is a deficient number, since it is larger than the sum of its proper divisors (945486151011).

1661057837469 is a wasteful number, since it uses less digits than its factorization.

1661057837469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337618 (or 1337612 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 1661057837469 in words is "one trillion, six hundred sixty-one billion, fifty-seven million, eight hundred thirty-seven thousand, four hundred sixty-nine".