1663015555127 has 4 divisors (see below), whose sum is σ = 1663070800080. Its totient is φ = 1662960310176.

The previous prime is 1663015555079. The next prime is 1663015555129. The reversal of 1663015555127 is 7215555103661.

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 1663015555127 - 2¹² = 1663015551031 is a prime.

It is a super-2 number, since 2×1663015555127² (a number of 25 digits) 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 (1663015555129) 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, 27577298 + ... + 27637535.

It is an arithmetic number, because the mean of its divisors is an integer number (415767700020).

Almost surely, 2^{1663015555127} is an apocalyptic number.

1663015555127 is a deficient number, since it is larger than the sum of its proper divisors (55244953).

1663015555127 is an equidigital number, since it uses as much as digits as its factorization.

1663015555127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55244952.

The product of its (nonzero) digits is 945000, while the sum is 47.

The spelling of 1663015555127 in words is "one trillion, six hundred sixty-three billion, fifteen million, five hundred fifty-five thousand, one hundred twenty-seven".