1661571606274 has 8 divisors (see below), whose sum is σ = 2495484585468. Its totient is φ = 829743411120.

The previous prime is 1661571606269. The next prime is 1661571606281. The reversal of 1661571606274 is 4726061751661.

It can be written as a sum of positive squares in 2 ways, for example, as 1508880573225 + 152691033049 = 1228365^2 + 390757^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521194017 + ... + 521197204.

Almost surely, 2^{1661571606274} is an apocalyptic number.

1661571606274 is a deficient number, since it is larger than the sum of its proper divisors (833912979194).

1661571606274 is a wasteful number, since it uses less digits than its factorization.

1661571606274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042392020.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 1661571606274 in words is "one trillion, six hundred sixty-one billion, five hundred seventy-one million, six hundred six thousand, two hundred seventy-four".