1661872230767 has 4 divisors (see below), whose sum is σ = 1899282549456. Its totient is φ = 1424461912080.

The previous prime is 1661872230719. The next prime is 1661872230773. The reversal of 1661872230767 is 7670322781661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1661872230767 - 2¹⁶ = 1661872165231 is a prime.

It is a super-3 number, since 3×1661872230767³ (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661872230167) 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, 118705159334 + ... + 118705159347.

It is an arithmetic number, because the mean of its divisors is an integer number (474820637364).

Almost surely, 2^{1661872230767} is an apocalyptic number.

1661872230767 is a deficient number, since it is larger than the sum of its proper divisors (237410318689).

1661872230767 is an equidigital number, since it uses as much as digits as its factorization.

1661872230767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237410318688.

The product of its (nonzero) digits is 7112448, while the sum is 56.

The spelling of 1661872230767 in words is "one trillion, six hundred sixty-one billion, eight hundred seventy-two million, two hundred thirty thousand, seven hundred sixty-seven".