1661992707 has 8 divisors (see below), whose sum is σ = 2216859840. Its totient is φ = 1107560360.

The previous prime is 1661992589. The next prime is 1661992711. The reversal of 1661992707 is 7072991661.

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 not a de Polignac number, because 1661992707 - 2¹² = 1661988611 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (1661992207) 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, 99669 + ... + 115142.

It is an arithmetic number, because the mean of its divisors is an integer number (277107480).

Almost surely, 2^1661992707 is an apocalyptic number.

1661992707 is a deficient number, since it is larger than the sum of its proper divisors (554867133).

1661992707 is a wasteful number, since it uses less digits than its factorization.

1661992707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217393.

The product of its (nonzero) digits is 285768, while the sum is 48.

The square root of 1661992707 is about 40767.5447752253. The cubic root of 1661992707 is about 1184.5217454428.

The spelling of 1661992707 in words is "one billion, six hundred sixty-one million, nine hundred ninety-two thousand, seven hundred seven".