1886664997 has 4 divisors (see below), whose sum is σ = 2156188576. Its totient is φ = 1617141420.

The previous prime is 1886664973. The next prime is 1886665043. The reversal of 1886664997 is 7994666881.

It is a happy number.

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 1886664997 - 2¹¹ = 1886662949 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 (1886664917) 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, 134761779 + ... + 134761792.

It is an arithmetic number, because the mean of its divisors is an integer number (539047144).

Almost surely, 2^1886664997 is an apocalyptic number.

It is an amenable number.

1886664997 is a deficient number, since it is larger than the sum of its proper divisors (269523579).

1886664997 is an equidigital number, since it uses as much as digits as its factorization.

1886664997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269523578.

The product of its digits is 31352832, while the sum is 64.

The square root of 1886664997 is about 43435.7571247469. The cubic root of 1886664997 is about 1235.6579396216.

The spelling of 1886664997 in words is "one billion, eight hundred eighty-six million, six hundred sixty-four thousand, nine hundred ninety-seven".