1661036572 has 12 divisors (see below), whose sum is σ = 3130415176. Its totient is φ = 766632240.

The previous prime is 1661036569. The next prime is 1661036591. The reversal of 1661036572 is 2756301661.

It is a super-2 number, since 2×1661036572² = 5518084987043022368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15971454 + ... + 15971557.

Almost surely, 2^1661036572 is an apocalyptic number.

It is an amenable number.

1661036572 is a deficient number, since it is larger than the sum of its proper divisors (1469378604).

1661036572 is a wasteful number, since it uses less digits than its factorization.

1661036572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31943028 (or 31943026 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1661036572 is about 40755.8164192548. The cubic root of 1661036572 is about 1184.2945523171.

The spelling of 1661036572 in words is "one billion, six hundred sixty-one million, thirty-six thousand, five hundred seventy-two".