40851851639 has 4 divisors (see below), whose sum is σ = 40852384800. Its totient is φ = 40851318480.

The previous prime is 40851851633. The next prime is 40851851647. The reversal of 40851851639 is 93615815804.

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 40851851639 - 2²⁸ = 40583416183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40851851633) 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, 127439 + ... + 312960.

It is an arithmetic number, because the mean of its divisors is an integer number (10213096200).

Almost surely, 2^40851851639 is an apocalyptic number.

40851851639 is a deficient number, since it is larger than the sum of its proper divisors (533161).

40851851639 is an equidigital number, since it uses as much as digits as its factorization.

40851851639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533160.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 40851851639 in words is "forty billion, eight hundred fifty-one million, eight hundred fifty-one thousand, six hundred thirty-nine".