1966547961829 has 4 divisors (see below), whose sum is σ = 2145325049280. Its totient is φ = 1787770874380.

The previous prime is 1966547961827. The next prime is 1966547961857. The reversal of 1966547961829 is 9281697456691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1966547961829 - 2¹ = 1966547961827 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 (1966547961823) 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, 89388543709 + ... + 89388543730.

It is an arithmetic number, because the mean of its divisors is an integer number (536331262320).

Almost surely, 2^{1966547961829} is an apocalyptic number.

It is an amenable number.

1966547961829 is a deficient number, since it is larger than the sum of its proper divisors (178777087451).

1966547961829 is a wasteful number, since it uses less digits than its factorization.

1966547961829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178777087450.

The product of its digits is 352719360, while the sum is 73.

The spelling of 1966547961829 in words is "one trillion, nine hundred sixty-six billion, five hundred forty-seven million, nine hundred sixty-one thousand, eight hundred twenty-nine".