74528820637 has 2 divisors, whose sum is σ = 74528820638. Its totient is φ = 74528820636.

The previous prime is 74528820601. The next prime is 74528820673. The reversal of 74528820637 is 73602882547.

It is a happy number.

Together with next prime (74528820673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (74528820601) and next prime (74528820673).

It can be written as a sum of positive squares in only one way, i.e., 51055210116 + 23473610521 = 225954^2 + 153211^2 .

It is a cyclic number.

It is not a de Polignac number, because 74528820637 - 2³⁵ = 40169082269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74528820137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37264410318 + 37264410319.

It is an arithmetic number, because the mean of its divisors is an integer number (37264410319).

Almost surely, 2^74528820637 is an apocalyptic number.

It is an amenable number.

74528820637 is a deficient number, since it is larger than the sum of its proper divisors (1).

74528820637 is an equidigital number, since it uses as much as digits as its factorization.

74528820637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 74528820637 in words is "seventy-four billion, five hundred twenty-eight million, eight hundred twenty thousand, six hundred thirty-seven".