661027697 has 4 divisors (see below), whose sum is σ = 721121136. Its totient is φ = 600934260.

The previous prime is 661027673. The next prime is 661027699. The reversal of 661027697 is 796720166.

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 a cyclic number.

It is not a de Polignac number, because 661027697 - 2¹⁰ = 661026673 is a prime.

It is a super-2 number, since 2×661027697² = 873915232402247618, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (661027699) 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, 30046703 + ... + 30046724.

It is an arithmetic number, because the mean of its divisors is an integer number (180280284).

Almost surely, 2^661027697 is an apocalyptic number.

It is an amenable number.

661027697 is a deficient number, since it is larger than the sum of its proper divisors (60093439).

661027697 is a wasteful number, since it uses less digits than its factorization.

661027697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60093438.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 661027697 is about 25710.4589029445. The cubic root of 661027697 is about 871.1104405235.

The spelling of 661027697 in words is "six hundred sixty-one million, twenty-seven thousand, six hundred ninety-seven".