1966615379 has 4 divisors (see below), whose sum is σ = 2019767184. Its totient is φ = 1913463576.

The previous prime is 1966615337. The next prime is 1966615429. The reversal of 1966615379 is 9735166691.

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 1966615379 - 2¹⁶ = 1966549843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966615379.

It is not an unprimeable number, because it can be changed into a prime (1966615279) 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, 26575847 + ... + 26575920.

It is an arithmetic number, because the mean of its divisors is an integer number (504941796).

Almost surely, 2^1966615379 is an apocalyptic number.

1966615379 is a deficient number, since it is larger than the sum of its proper divisors (53151805).

1966615379 is an equidigital number, since it uses as much as digits as its factorization.

1966615379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53151804.

The product of its digits is 1837080, while the sum is 53.

The square root of 1966615379 is about 44346.5373958328. The cubic root of 1966615379 is about 1252.8713467639.

The spelling of 1966615379 in words is "one billion, nine hundred sixty-six million, six hundred fifteen thousand, three hundred seventy-nine".