1661057837467 has 4 divisors (see below), whose sum is σ = 1898351814256. Its totient is φ = 1423763860680.

The previous prime is 1661057837447. The next prime is 1661057837489. The reversal of 1661057837467 is 7647387501661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1661057837467 - 2⁷ = 1661057837339 is a prime.

It is a super-3 number, since 3×1661057837467³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 118646988384 + ... + 118646988397.

It is an arithmetic number, because the mean of its divisors is an integer number (474587953564).

Almost surely, 2^{1661057837467} is an apocalyptic number.

1661057837467 is a deficient number, since it is larger than the sum of its proper divisors (237293976789).

1661057837467 is an equidigital number, since it uses as much as digits as its factorization.

1661057837467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237293976788.

The product of its (nonzero) digits is 35562240, while the sum is 61.

The spelling of 1661057837467 in words is "one trillion, six hundred sixty-one billion, fifty-seven million, eight hundred thirty-seven thousand, four hundred sixty-seven".