1661067629 has 8 divisors (see below), whose sum is σ = 1810395552. Its totient is φ = 1514818800.

The previous prime is 1661067601. The next prime is 1661067691. The reversal of 1661067629 is 9267601661.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1661067629 is a prime.

It is a super-2 number, since 2×1661067629² = 5518291336223363282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1661067629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661067029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768647 + ... + 770804.

It is an arithmetic number, because the mean of its divisors is an integer number (226299444).

Almost surely, 2^1661067629 is an apocalyptic number.

It is an amenable number.

1661067629 is a deficient number, since it is larger than the sum of its proper divisors (149327923).

1661067629 is a wasteful number, since it uses less digits than its factorization.

1661067629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539547.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 1661067629 is about 40756.1974305749. The cubic root of 1661067629 is about 1184.3019333319.

The spelling of 1661067629 in words is "one billion, six hundred sixty-one million, sixty-seven thousand, six hundred twenty-nine".