1631665440155 has 4 divisors (see below), whose sum is σ = 1957998528192. Its totient is φ = 1305332352120.

The previous prime is 1631665440143. The next prime is 1631665440169. The reversal of 1631665440155 is 5510445661361.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1631665440155 - 2³⁰ = 1630591698331 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163166544011 + ... + 163166544020.

It is an arithmetic number, because the mean of its divisors is an integer number (489499632048).

Almost surely, 2^{1631665440155} is an apocalyptic number.

1631665440155 is a deficient number, since it is larger than the sum of its proper divisors (326333088037).

1631665440155 is an equidigital number, since it uses as much as digits as its factorization.

1631665440155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326333088036.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 1631665440155 in words is "one trillion, six hundred thirty-one billion, six hundred sixty-five million, four hundred forty thousand, one hundred fifty-five".