1873397817661 has 8 divisors (see below), whose sum is σ = 1875667606400. Its totient is φ = 1871128848960.

The previous prime is 1873397817653. The next prime is 1873397817671. The reversal of 1873397817661 is 1667187933781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1873397817661 - 2³ = 1873397817653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1873397817671) 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, 4430110 + ... + 4834528.

It is an arithmetic number, because the mean of its divisors is an integer number (234458450800).

Almost surely, 2^{1873397817661} is an apocalyptic number.

It is an amenable number.

1873397817661 is a deficient number, since it is larger than the sum of its proper divisors (2269788739).

1873397817661 is a wasteful number, since it uses less digits than its factorization.

1873397817661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410019.

The product of its digits is 64012032, while the sum is 67.

The spelling of 1873397817661 in words is "one trillion, eight hundred seventy-three billion, three hundred ninety-seven million, eight hundred seventeen thousand, six hundred sixty-one".