3651661672371 has 6 divisors (see below), whose sum is σ = 5274622415660. Its totient is φ = 2434441114908.

The previous prime is 3651661672369. The next prime is 3651661672387. The reversal of 3651661672371 is 1732761661563.

3651661672371 is a `hidden beast` number, since 3 + 6 + 5 + 16 + 616 + 7 + 2 + 3 + 7 + 1 = 666.

It is not a de Polignac number, because 3651661672371 - 2¹ = 3651661672369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3651661672171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202870092901 + ... + 202870092918.

Almost surely, 2^{3651661672371} is an apocalyptic number.

3651661672371 is a deficient number, since it is larger than the sum of its proper divisors (1622960743289).

3651661672371 is a wasteful number, since it uses less digits than its factorization.

3651661672371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405740185825 (or 405740185822 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 3651661672371 in words is "three trillion, six hundred fifty-one billion, six hundred sixty-one million, six hundred seventy-two thousand, three hundred seventy-one".