40640541626 has 4 divisors (see below), whose sum is σ = 60960812442. Its totient is φ = 20320270812.

The previous prime is 40640541619. The next prime is 40640541631. The reversal of 40640541626 is 62614504604.

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

It can be written as a sum of positive squares in only one way, i.e., 34875936001 + 5764605625 = 186751^2 + 75925^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40640541626.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160135405 + ... + 10160135408.

Almost surely, 2^40640541626 is an apocalyptic number.

40640541626 is a deficient number, since it is larger than the sum of its proper divisors (20320270816).

40640541626 is a wasteful number, since it uses less digits than its factorization.

40640541626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20320270815.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 40640541626 in words is "forty billion, six hundred forty million, five hundred forty-one thousand, six hundred twenty-six".