74351541661 has 4 divisors (see below), whose sum is σ = 74660054524. Its totient is φ = 74043028800.

The previous prime is 74351541623. The next prime is 74351541679. The reversal of 74351541661 is 16614515347.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50262949636 + 24088592025 = 224194^2 + 155205^2 .

It is a cyclic number.

It is not a de Polignac number, because 74351541661 - 2⁹ = 74351541149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74351541161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154256070 + ... + 154256551.

It is an arithmetic number, because the mean of its divisors is an integer number (18665013631).

Almost surely, 2^74351541661 is an apocalyptic number.

It is an amenable number.

74351541661 is a deficient number, since it is larger than the sum of its proper divisors (308512863).

74351541661 is a wasteful number, since it uses less digits than its factorization.

74351541661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308512862.

The product of its digits is 302400, while the sum is 43.

The spelling of 74351541661 in words is "seventy-four billion, three hundred fifty-one million, five hundred forty-one thousand, six hundred sixty-one".