545021887631 has 4 divisors (see below), whose sum is σ = 586946648232. Its totient is φ = 503097127032.

The previous prime is 545021887589. The next prime is 545021887639. The reversal of 545021887631 is 136788120545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136788120545 = 5 ⋅27357624109.

It is a cyclic number.

It is not a de Polignac number, because 545021887631 - 2³⁴ = 527842018447 is a prime.

It is a super-2 number, since 2×545021887631² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545021887631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545021887639) 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, 20962380281 + ... + 20962380306.

It is an arithmetic number, because the mean of its divisors is an integer number (146736662058).

Almost surely, 2^545021887631 is an apocalyptic number.

545021887631 is a deficient number, since it is larger than the sum of its proper divisors (41924760601).

545021887631 is a wasteful number, since it uses less digits than its factorization.

545021887631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41924760600.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 545021887631 in words is "five hundred forty-five billion, twenty-one million, eight hundred eighty-seven thousand, six hundred thirty-one".