661448526 has 16 divisors (see below), whose sum is σ = 1325735424. Its totient is φ = 220009784.

The previous prime is 661448509. The next prime is 661448527. The reversal of 661448526 is 625844166.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661448527) 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, 115230 + ... + 120833.

It is an arithmetic number, because the mean of its divisors is an integer number (82858464).

Almost surely, 2^661448526 is an apocalyptic number.

661448526 is an abundant number, since it is smaller than the sum of its proper divisors (664286898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661448526 is a wasteful number, since it uses less digits than its factorization.

661448526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236535.

The product of its digits is 276480, while the sum is 42.

The square root of 661448526 is about 25718.6416048749. The cubic root of 661448526 is about 871.2952591885.

The spelling of 661448526 in words is "six hundred sixty-one million, four hundred forty-eight thousand, five hundred twenty-six".