1690550661 has 8 divisors (see below), whose sum is σ = 2302026624. Its totient is φ = 1103054240.

The previous prime is 1690550657. The next prime is 1690550711. The reversal of 1690550661 is 1660550961.

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 1690550661 - 2² = 1690550657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690550861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5994720 + ... + 5995001.

It is an arithmetic number, because the mean of its divisors is an integer number (287753328).

Almost surely, 2^1690550661 is an apocalyptic number.

It is an amenable number.

1690550661 is a deficient number, since it is larger than the sum of its proper divisors (611475963).

1690550661 is a wasteful number, since it uses less digits than its factorization.

1690550661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11989771.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 1690550661 is about 41116.3065097049. The cubic root of 1690550661 is about 1191.2677826421.

The spelling of 1690550661 in words is "one billion, six hundred ninety million, five hundred fifty thousand, six hundred sixty-one".