1663614871 has 4 divisors (see below), whose sum is σ = 1663749000. Its totient is φ = 1663480744.

The previous prime is 1663614853. The next prime is 1663614877. The reversal of 1663614871 is 1784163661.

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 1663614871 - 2¹¹ = 1663612823 is a prime.

It is a super-2 number, since 2×1663614871² = 5535228878024693282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663614877) 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, 46321 + ... + 73978.

It is an arithmetic number, because the mean of its divisors is an integer number (415937250).

Almost surely, 2^1663614871 is an apocalyptic number.

1663614871 is a deficient number, since it is larger than the sum of its proper divisors (134129).

1663614871 is a wasteful number, since it uses less digits than its factorization.

1663614871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134128.

The product of its digits is 145152, while the sum is 43.

The square root of 1663614871 is about 40787.4352098781. The cubic root of 1663614871 is about 1184.9069985823.

The spelling of 1663614871 in words is "one billion, six hundred sixty-three million, six hundred fourteen thousand, eight hundred seventy-one".