661627897 has 8 divisors (see below), whose sum is σ = 757895936. Its totient is φ = 565797312.

The previous prime is 661627891. The next prime is 661627903. The reversal of 661627897 is 798726166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (661627891) and next prime (661627903).

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-661627897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661627891) 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, 106113 + ... + 112174.

It is an arithmetic number, because the mean of its divisors is an integer number (94736992).

Almost surely, 2^661627897 is an apocalyptic number.

It is an amenable number.

661627897 is a deficient number, since it is larger than the sum of its proper divisors (96268039).

661627897 is a wasteful number, since it uses less digits than its factorization.

661627897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218727.

The product of its digits is 1524096, while the sum is 52.

The square root of 661627897 is about 25722.1285472256. The cubic root of 661627897 is about 871.3740110847.

The spelling of 661627897 in words is "six hundred sixty-one million, six hundred twenty-seven thousand, eight hundred ninety-seven".