74404640061 has 24 divisors (see below), whose sum is σ = 113849681400. Its totient is φ = 46662967296.

The previous prime is 74404640059. The next prime is 74404640069. The reversal of 74404640061 is 16004640447.

74404640061 is a `hidden beast` number, since 7 + 4 + 4 + 0 + 4 + 640 + 0 + 6 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6807240036 + 67597400025 = 82506^2 + 259995^2 .

It is not a de Polignac number, because 74404640061 - 2¹ = 74404640059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74404639998 and 74404640025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74404640069) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208215 + ... + 438363.

It is an arithmetic number, because the mean of its divisors is an integer number (4743736725).

Almost surely, 2^74404640061 is an apocalyptic number.

It is an amenable number.

74404640061 is a deficient number, since it is larger than the sum of its proper divisors (39445041339).

74404640061 is a wasteful number, since it uses less digits than its factorization.

74404640061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232285 (or 232282 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The spelling of 74404640061 in words is "seventy-four billion, four hundred four million, six hundred forty thousand, sixty-one".