1661350097 has 4 divisors (see below), whose sum is σ = 1812381936. Its totient is φ = 1510318260.

The previous prime is 1661350051. The next prime is 1661350241. The reversal of 1661350097 is 7900531661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1661350097 - 2²⁰ = 1660301521 is a prime.

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 1661350097.

It is not an unprimeable number, because it can be changed into a prime (1661350997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75515903 + ... + 75515924.

It is an arithmetic number, because the mean of its divisors is an integer number (453095484).

Almost surely, 2^1661350097 is an apocalyptic number.

It is an amenable number.

1661350097 is a deficient number, since it is larger than the sum of its proper divisors (151031839).

1661350097 is a wasteful number, since it uses less digits than its factorization.

1661350097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151031838.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 1661350097 is about 40759.6626212730. The cubic root of 1661350097 is about 1184.3690605281.

The spelling of 1661350097 in words is "one billion, six hundred sixty-one million, three hundred fifty thousand, ninety-seven".