74355561 has 12 divisors (see below), whose sum is σ = 122745792. Its totient is φ = 42488856.

The previous prime is 74355539. The next prime is 74355563. The reversal of 74355561 is 16555347.

74355561 is a `hidden beast` number, since 7 + 43 + 55 + 561 = 666.

It is not a de Polignac number, because 74355561 - 2¹⁷ = 74224489 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (74355563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 590061 + ... + 590186.

It is an arithmetic number, because the mean of its divisors is an integer number (10228816).

Almost surely, 2^74355561 is an apocalyptic number.

It is an amenable number.

74355561 is a deficient number, since it is larger than the sum of its proper divisors (48390231).

74355561 is a wasteful number, since it uses less digits than its factorization.

74355561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180260 (or 1180257 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 74355561 is about 8622.9670647637. The cubic root of 74355561 is about 420.5049878217.

It can be divided in two parts, 7435 and 5561, that added together give a square (12996 = 114²).

The spelling of 74355561 in words is "seventy-four million, three hundred fifty-five thousand, five hundred sixty-one".