661620527 has 8 divisors (see below), whose sum is σ = 698646000. Its totient is φ = 624815424.

The previous prime is 661620523. The next prime is 661620541. The reversal of 661620527 is 725026166.

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 661620527 - 2² = 661620523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661620521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48902 + ... + 60947.

It is an arithmetic number, because the mean of its divisors is an integer number (87330750).

Almost surely, 2^661620527 is an apocalyptic number.

661620527 is a deficient number, since it is larger than the sum of its proper divisors (37025473).

661620527 is a wasteful number, since it uses less digits than its factorization.

661620527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110185.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 661620527 is about 25721.9852849659. The cubic root of 661620527 is about 871.3707756053.

The spelling of 661620527 in words is "six hundred sixty-one million, six hundred twenty thousand, five hundred twenty-seven".