40511551061 has 4 divisors (see below), whose sum is σ = 40543987500. Its totient is φ = 40479114624.

The previous prime is 40511551039. The next prime is 40511551079. The reversal of 40511551061 is 16015511504.

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 14909631025 + 25601920036 = 122105^2 + 160006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40511551061 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 (40511551961) 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, 16216346 + ... + 16218843.

It is an arithmetic number, because the mean of its divisors is an integer number (10135996875).

Almost surely, 2^40511551061 is an apocalyptic number.

It is an amenable number.

40511551061 is a deficient number, since it is larger than the sum of its proper divisors (32436439).

40511551061 is a wasteful number, since it uses less digits than its factorization.

40511551061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32436438.

The product of its (nonzero) digits is 3000, while the sum is 29.

The spelling of 40511551061 in words is "forty billion, five hundred eleven million, five hundred fifty-one thousand, sixty-one".