31545540021518 has 4 divisors (see below), whose sum is σ = 47318310032280. Its totient is φ = 15772770010758.

The previous prime is 31545540021511. The next prime is 31545540021547. The reversal of 31545540021518 is 81512004554513.

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

It is a super-3 number, since 3×31545540021518³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31545540021511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7886385005378 + ... + 7886385005381.

It is an arithmetic number, because the mean of its divisors is an integer number (11829577508070).

Almost surely, 2^{31545540021518} is an apocalyptic number.

31545540021518 is a deficient number, since it is larger than the sum of its proper divisors (15772770010762).

31545540021518 is a wasteful number, since it uses less digits than its factorization.

31545540021518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15772770010761.

The product of its (nonzero) digits is 480000, while the sum is 44.

The spelling of 31545540021518 in words is "thirty-one trillion, five hundred forty-five billion, five hundred forty million, twenty-one thousand, five hundred eighteen".