40181621057 has 2 divisors, whose sum is σ = 40181621058. Its totient is φ = 40181621056.

The previous prime is 40181620987. The next prime is 40181621063. The reversal of 40181621057 is 75012618104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26383829761 + 13797791296 = 162431^2 + 117464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40181621057 is a prime.

It is a super-2 number, since 2×40181621057² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40181621087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20090810528 + 20090810529.

It is an arithmetic number, because the mean of its divisors is an integer number (20090810529).

Almost surely, 2^40181621057 is an apocalyptic number.

It is an amenable number.

40181621057 is a deficient number, since it is larger than the sum of its proper divisors (1).

40181621057 is an equidigital number, since it uses as much as digits as its factorization.

40181621057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 40181621057 in words is "forty billion, one hundred eighty-one million, six hundred twenty-one thousand, fifty-seven".