74840574649 has 2 divisors, whose sum is σ = 74840574650. Its totient is φ = 74840574648.

The previous prime is 74840574593. The next prime is 74840574719. The reversal of 74840574649 is 94647504847.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44465313424 + 30375261225 = 210868^2 + 174285^2 .

It is a cyclic number.

It is not a de Polignac number, because 74840574649 - 2³¹ = 72693091001 is a prime.

It is a super-2 number, since 2×74840574649² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 74840574593 and 74840574602.

It is not a weakly prime, because it can be changed into another prime (74840574049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37420287324 + 37420287325.

It is an arithmetic number, because the mean of its divisors is an integer number (37420287325).

Almost surely, 2^74840574649 is an apocalyptic number.

It is an amenable number.

74840574649 is a deficient number, since it is larger than the sum of its proper divisors (1).

74840574649 is an equidigital number, since it uses as much as digits as its factorization.

74840574649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27095040, while the sum is 58.

The spelling of 74840574649 in words is "seventy-four billion, eight hundred forty million, five hundred seventy-four thousand, six hundred forty-nine".