74687603547421 has 2 divisors, whose sum is σ = 74687603547422. Its totient is φ = 74687603547420.

The previous prime is 74687603547409. The next prime is 74687603547437. The reversal of 74687603547421 is 12474530678647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70144477552900 + 4543125994521 = 8375230^2 + 2131461^2 .

It is a cyclic number.

It is not a de Polignac number, because 74687603547421 - 2²¹ = 74687601450269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74687603547121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37343801773710 + 37343801773711.

It is an arithmetic number, because the mean of its divisors is an integer number (37343801773711).

Almost surely, 2^{74687603547421} is an apocalyptic number.

It is an amenable number.

74687603547421 is a deficient number, since it is larger than the sum of its proper divisors (1).

74687603547421 is an equidigital number, since it uses as much as digits as its factorization.

74687603547421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189665280, while the sum is 64.

The spelling of 74687603547421 in words is "seventy-four trillion, six hundred eighty-seven billion, six hundred three million, five hundred forty-seven thousand, four hundred twenty-one".