31145665645 has 8 divisors (see below), whose sum is σ = 37376340120. Its totient is φ = 24915504960.

The previous prime is 31145665633. The next prime is 31145665667. The reversal of 31145665645 is 54656654113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 131285764 + 31014379881 = 11458^2 + 176109^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31145665645 - 2¹⁵ = 31145632877 is a prime.

It is a super-3 number, since 3×31145665645³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31145665595 and 31145665604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20655 + ... + 250435.

It is an arithmetic number, because the mean of its divisors is an integer number (4672042515).

Almost surely, 2^31145665645 is an apocalyptic number.

It is an amenable number.

31145665645 is a deficient number, since it is larger than the sum of its proper divisors (6230674475).

31145665645 is a wasteful number, since it uses less digits than its factorization.

31145665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256895.

The product of its digits is 1296000, while the sum is 46.

It can be divided in two parts, 31145 and 665645, that added together give a triangular number (696790 = T₁₁₈₀).

The spelling of 31145665645 in words is "thirty-one billion, one hundred forty-five million, six hundred sixty-five thousand, six hundred forty-five".