1001655642631 has 4 divisors (see below), whose sum is σ = 1144749305872. Its totient is φ = 858561979392.

The previous prime is 1001655642577. The next prime is 1001655642643. The reversal of 1001655642631 is 1362465561001.

It is a happy number.

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 1001655642631 - 2²¹ = 1001653545479 is a prime.

It is a super-2 number, since 2×1001655642631² (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 (1001655642731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71546831610 + ... + 71546831623.

It is an arithmetic number, because the mean of its divisors is an integer number (286187326468).

Almost surely, 2^{1001655642631} is an apocalyptic number.

1001655642631 is a deficient number, since it is larger than the sum of its proper divisors (143093663241).

1001655642631 is an equidigital number, since it uses as much as digits as its factorization.

1001655642631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143093663240.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 1001655642631 in words is "one trillion, one billion, six hundred fifty-five million, six hundred forty-two thousand, six hundred thirty-one".