661532459 has 16 divisors (see below), whose sum is σ = 763772928. Its totient is φ = 561248352.

The previous prime is 661532453. The next prime is 661532471. The reversal of 661532459 is 954235166.

It is not a de Polignac number, because 661532459 - 2¹² = 661528363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661532453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672482 + ... + 673464.

It is an arithmetic number, because the mean of its divisors is an integer number (47735808).

Almost surely, 2^661532459 is an apocalyptic number.

661532459 is a deficient number, since it is larger than the sum of its proper divisors (102240469).

661532459 is a wasteful number, since it uses less digits than its factorization.

661532459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874.

The product of its digits is 194400, while the sum is 41.

The square root of 661532459 is about 25720.2733072571. The cubic root of 661532459 is about 871.3321113038.

The spelling of 661532459 in words is "six hundred sixty-one million, five hundred thirty-two thousand, four hundred fifty-nine".