40234234642645 has 4 divisors (see below), whose sum is σ = 48281081571180. Its totient is φ = 32187387714112.

The previous prime is 40234234642619. The next prime is 40234234642649. The reversal of 40234234642645 is 54624643243204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18994874772721 + 21239359869924 = 4358311^2 + 4608618^2 .

It is a cyclic number.

It is not a de Polignac number, because 40234234642645 - 2¹³ = 40234234634453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40234234642649) 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, 4023423464260 + ... + 4023423464269.

It is an arithmetic number, because the mean of its divisors is an integer number (12070270392795).

Almost surely, 2^{40234234642645} is an apocalyptic number.

It is an amenable number.

40234234642645 is a deficient number, since it is larger than the sum of its proper divisors (8046846928535).

40234234642645 is an equidigital number, since it uses as much as digits as its factorization.

40234234642645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046846928534.

The product of its (nonzero) digits is 13271040, while the sum is 49.

Adding to 40234234642645 its reverse (54624643243204), we get a palindrome (94858877885849).

The spelling of 40234234642645 in words is "forty trillion, two hundred thirty-four billion, two hundred thirty-four million, six hundred forty-two thousand, six hundred forty-five".